Final answer:
The earnest money will need to be deposited on Tuesday, January 17th.
Step-by-step explanation:
The earnest money will need to be deposited on Tuesday, January 17th.
According to the given information, the buyer and seller signed the agreement on Sunday, January 15th, and agreed that CBS Realty will hold the earnest money. Typically, earnest money is deposited within a few days of signing the agreement, allowing time for the necessary paperwork and processes. Therefore, the earnest money should be deposited on the next business day after Sunday, which is Tuesday, January 17th.