Pym Had an Idea for an Invention

Pym had an idea for an invention. Campbell agreed to purchase a share of that invention, but only if it was approved within one week by two specific engineers, who were independent of the parties. One of the engineers gave his approval, but the other, who was on vacation, did not. Pym nevertheless claimed that Campbell was required to proceed with the anticipated purchase. Which of the following statements is most likely TRUE?

A) Pym's argument will succeed because Campbell has breached a term of the contract.
B) Pym's argument will fail because the parties' agreement was subject to a true condition subsequent.
C) Pym's argument will fail because the parties' agreement was frustrated.
D) Pym's argument will succeed on the basis of the concept of self- induced impossibility.
E) Pym's argument will fail because the contract was subject to a condition precedent that was not satisfied.