As an important part of the national economy, the survival status of small and micro enterprises is directly related to the healthy development of the national economy. In order to increase support for small and micro enterprises,

A

Test question analysis: Support the development of small and micro enterprises through preferential interest rate policies, so the transmission source is the preferential interest rate policy, that is, the loan interest rate decreases, small and micro enterprises The loan burden on enterprises is reduced, the amount of loans increases, investment increases, and the output and production level of enterprises increase, thus promoting the development of small and micro enterprises. A is correct; BCD is incorrect.