Either the house or senate can a bill.

Either the House of Senate can introduce a bill.

Explanation:

The legislative system of the United States is bicameral, so the proposal for bills begins the same in the Senate as in the House of Representatives, depending on whether it is presented by a senator or a representative.

The representatives or senators in charge of promoting the bill meet in small groups to study, exchange opinions, make changes or rewrite the project in question.

They then vote to accept or reject the document and the changes before returning it to the House of Representatives or the Senate for general debate. If approved by the majority, it is sent to one or another chamber of Congress to go through a similar process that includes debate, possible modifications and voting.  

The president of the United States, who is in charge of signing or not signing it into law, must arrive at a final version in which both versions (of the Senate and the House of Representatives) agree.

b) they want the land taken away from the wealthy landowners and given to peasants.