Which of the following is the first step in the amendment process under the constitution

A) proposal and debate of new idea

B) House of representatives passes new proposal

C) Senate vote on wether they want to hear new proposal

House of representatives passes new proposal

Explanation:

The proposal already exists written as an idea. Then the first step is that houses (Two-thirds of them) of Congress pass the new idea (proposal) as a constitutional amendment.

After that this new amendment is passed to states so they can ratify. The Three-fourths need to agree for the new amendment to be accepted as a valid one and continue with the process itself.