Frank Hires Saul to Landscape His Yard,but When Saul Attempts

Multiple Choice

Frank hires Saul to landscape his yard,but when Saul attempts to begin landscaping,Frank refuses to allow Saul to enter the land.Which of the following statements is true?

A) Frank's duty to pay is subject to a constructive condition that Saul completes the landscaping job.
B) Any claim Saul would bring would be made in bad faith.
C) Saul can only be excused from performance if the parties mutually agree to rescind the contract.
D) Saul can sue Frank for damages for breach of contract.