Please help me in clarifying which answer it would be. Additionally, please provide a short explanation on why that would be the answer.

Robert contracts to paint Jake's house for $500. Robert then asks Elmer to perform the painting work for him. Elmer does a bad job, and Jake wants to sue for breach of contact. Which of the following is true?

A. Elmer, but not Robert, is responsible for the breach.

B. Robert is responsible for the breach of the contract. (One of my thoughts)

C. Robert is responsible for the breach of the contract only if there has been a novation.

D. Robert isn't responsible if he gave Jake notice of the delegation (The answer I am leaning towards)

Tom and Zeke enter into a contract for Tom to paint Zeke's house for $1,000. The contract doesn't specify a time for performance by Tom. Six years later, Tom shows up with a bucket of paint, paints the house, and demands payment. Which of the following is true?

A. The contract was unenforceable because it didn't specify a time for performance.

B. Tom breached the contract because he didn't perform within a reasonable time. (I think that this is the correct answer)

C. The contract violates the statute of frauds.

D. Tom couldn't have breached the contract because the contract didn't specify a time for performance, and he did do the painting work (this would be my only other guess)