In which type of election would citizens be most likely to vote on a proposition?

a. closed primary

b. runoff

c. general

d. open primary

The right answer is General Election.  option C

In the US, a general election is a local, state, or national election in which the candidates have been selected by a primary election. This kind of election are held to control which political party, independent, or write-in candidate will lodge each office that set up for the election. A voter might split the ticket to select candidates from all parties on the secret ballot; but a voter can only choose just one candidate per each spot in the election.  

answer; nonpartisan election;