Question

why does burr warn them to \lower your voices\?
to remind them that speaking out is risky and could lead to danger during the revolution
to encourage them to speak louder.
to suggest they stop discussing politics altogether.
to tell them to sing quietly.

Explanation:

During a revolution, speaking out can be dangerous. Burr's warning to lower voices likely aims to remind them of this risk. The other options are inconsistent with the meaning of "lower your voices".

Answer:

To remind them that speaking out is risky and could lead to danger during the revolution