I do believe it is the Senate.
Answer:
A referendum (plural: referendums or less commonly referenda) is a direct vote in which an entire electorate is invited to vote on a particular proposal. This may result in the adoption of a new law. In some countries, it is synonymous with a plebiscite or a vote on a ballot question.
Explanation:
Answer:
B. The President.
Explanation:
Congress can declare war.