What was the reason for the implementation of the maritime ban policy in the early Qing Dynasty?

The answer is the most appropriate. The analysis is as follows: a country will not ban foreign trade for no reason, especially in the feudal society where maritime trade can bring huge taxes to the court. So the emperor decided to ban the sea, because the overseas trade and maritime activities at that time were unfavorable to the court and might endanger the country. At the beginning of the Qing Dynasty, although the children of the Eight Banners conquered most of China and defeated the remnants of the Ming Dynasty in the south and the peasant rebels in various places, the situation was not yet stable, and anti-Qing activities still occurred from time to time. The biggest threat was the Zheng family in Taiwan Province Island and Fujian coastal state capital. However, in the early Qing Dynasty, the Qing court did not have a decent navy to attack Taiwan by force. The maritime power of the Zheng family mainly came from the remaining naval officers and soldiers of the Ming Dynasty and the pirate forces in Southeast Asia (his father was a famous pirate leader in Southeast Asia, and was later wooed by the Ming Dynasty and was named "Commander of the Daming Navy" to fight against the Qing Dynasty), so the Qing court had to wait until a decent navy was trained before sending troops to recover Taiwan Province Province. However, during this period, the Qing court also hoped to trouble Taiwan Province Province by banning trade (at that time, Taiwan Province Province was still an underdeveloped area, and materials, money and weapons depended on trade with Guangdong and Fujian. At the same time, people in Guangdong and Fujian provinces don't want to "clear", so they often secretly support the anti-Qing forces in Taiwan Province Province and have secret exchanges with them. Therefore, once the sea ban is declared, Taiwan Province Province will be deprived of water and food, people will be unable to secretly communicate with Taiwan Province Province, and the Zheng family will struggle. It is easy to explain that most countries in Southeast Asia are afraid to help Taiwan Province Province because of the warnings and threats from the Qing court. This is to prevent the Netherlands, Portugal and other countries that often conduct maritime trade between Asia and Europe from buying things from the mainland and selling them to Taiwan Province Province. However, when the two wings of the Qing navy formed, Taiwan Province Province directly settled in, and the sea ban policy stopped, so the answer was A. ..

As for the other three answers, it is obvious that the emperor will not care. Looking at answers B and C, will the emperor be interested in interfering with ordinary people doing business with foreigners, and will he "fight" by banning the sea? And at the same time, the Qing royal family also had to do business with foreigners! For example, I bought a Buddha Lang machine from the Portuguese and a red gun against the anti-Qing armed forces. Answer d is even more ridiculous. what do you think? Don't say that the emperor doesn't want people to emigrate. At that time, people didn't want to leave their homes, so they went to Siam, Annan and Japanese territory!