Which of the Following Is a Common Assumption That Economists

Which of the following is a common assumption that economists make about the behaviour of elected officials?  

A)  that elected officials try to maximize the size of their government salaries 
B)  that elected officials try to maximize their control over the budget process 
C)  that elected officials try to maximize the number of votes they receive in the next election 
D)  that elected officials try to maximize the government's expenditures