The correct answer for this Question is A. That is They showed and measured his popular support.
It was a National vote, where the government could directly go to the people with the help of the political parties. It was seen as an expression of popular sovereignty in France after the "Revolution of 1789". Through this Plebiscite, Napoleon was promoted from the first consul to the Consul for life in 1802. Although this position (Consul for life) of Napoleon was rejected by the Senate but the national plebiscite supported him to gain the same position and made him Emperor in 1804.