What was the main reason for the execution of king louis xvi in 1793?

select the best answer from the choices provided.

a. he refused to accept the declaration of the rights of man and citizen.
b. his wife, marie antoinette, openly mocked commoners and the national assembly.
c. he has arranged for the assassination of robespierre, the leader of the committee of public safety.
d. many people suspected that he was committing treason by working with the kings of austria and prussia.