What is the name of the U.S. Supreme Court case where the Court found the line-item veto unconstitutional?

When an offer to purchase is made on a property on which sales contract already exits, the licensee should be sure that the subsequent offer contains a contingency. If it does not, the licensee should:

A. Advise the seller to reject the offer and make a counteroffer contingent on the first contract nor closing. B. Not present the offer to the seller. C. Advise the seller to accept it and write in such a clause. D. Advise the seller to accept the new offer. and cancel the exiting contract.

Express warranties must be written

Indicate whether the statement is true or false