Julia,a World-Famous Chef,signs a Contract to Give Lessons in French

Julia,a world-famous chef,signs a contract to give lessons in French cooking to Kyle.Julia wants to transfer her duties under the contract to Leila,a short-order cook at Mom's Café.The transfer is

A) valid because the performance required is of a nonpersonal nature.
B) valid if Leila is a highly regarded short-order cook.
C) not valid because performance depends on Julia's personal skills.
D) not valid if Kyle does not hold Leila in high regard.