Janet promises eli $4,000 for one of his original paintings on the condition that she receive $1 million from her mother's will. janet has made:
a. an illusory promise.
b. a legally sufficient promise unless janet knew at the time she made the promise that she could not inherit the $1 million.
c. a conditional promise which is not sufficient to form consideration.
d. a legally inadequate promise, and the courts will therefore not enforce it.