Joy and Kris enter into a contract for Kris to lay sod in Joy's yard for which she agrees to pay Kris. When Kris's schedule conflicts, she contacts Leza, to whom Kris "assigns all rights under the contract." Kris is
a. absolved of any liability under the contract.
b. liable to Leza for inducing a prohibited contract.
c. liable to Joy if Leza does not perform.
d. in breach of the contract with Joy.