The main purpose of the census was to
a. register the number of people
c. monitor the wealth of the city
b. register the number of slaves and slaveholders
d. determine how many wives each man had.

The correct answer is option a. "register the number of people".

Explanation:

In Ancient Rome, the government decided that it was necessary to have a record of the number of people in its territory in order to perform certain activities such as taxation. Different approaches were taken to achieve the goal to record how many people lived in the Roman Empire, but eventually the problem was solved by the creation of a body of “census takers”. The census takers traveled all along the Roman Empire to register the number of people in each city.

whose power in the senate is equal to the power of the speaker of the house?