(20 17 Zhenti) Enterprise A is a private non-coal mine enterprise, and its emergency plan should be filed in ().

According to Article 26 of the Measures for the Administration of Emergency Plans for Production Safety Accidents, production and business operation entities shall, within 20 working days from the date of publication of emergency plans, file information with the safety production supervision and management departments and relevant departments in accordance with the principle of hierarchical territoriality.

The emergency plan of the central enterprise headquarters (listed company) shall be reported to the competent department of production safety supervision and management of the State Council for the record, and copied to the State Administration of Work Safety; The emergency plan of the subordinate unit shall be reported to the competent department responsible for the supervision and administration of production safety of the local province, autonomous region, municipality directly under the Central Government or district-level people's government for the record, and copied to the supervision and administration of production safety at the same level.

Emergency plans for non-coal mines, metal smelting and enterprises producing, managing and storing dangerous chemicals other than those mentioned in the preceding paragraph, as well as chemical enterprises and fireworks and firecrackers production and wholesale enterprises that use the quantity of dangerous chemicals as stipulated by the state, shall be reported to the safety production supervision and management department of the local people's government at or above the county level for the record according to the affiliation; The filing of emergency plans for other production and business units shall be decided by the departments responsible for the supervision and administration of production safety under the people's governments of provinces, autonomous regions and municipalities directly under the Central Government.

The emergency plan of the oil and gas pipeline operation unit shall be filed in accordance with the provisions of the first and second paragraphs of this article, and copied to the county-level safety production supervision and management departments across administrative regions.

The emergency plan of coal mining enterprises shall be filed in accordance with the provisions of the first and second paragraphs of this article, and copied to the local coal mine safety supervision institution.

Therefore, this question should choose option a.