Wayne helped Hank study all night for an important exam. After Hank got an $"$A$"$ on the exam, he told Wayne, "I want to pay you $$10$ for helping me get a good grade." Wayne said, "Thanks, I'll take it$."$ Which of the following is the best choice regarding this situation?

Group of answer choices

No contract exists because mutual assent is lacking.

No contract exists because consideration is lacking. Wayne did not bargain with Hank for the $$10$ before helping Hank study.

No contract exists because $$10$ is not enough.

A contract exists because the consideration is sufficient.

Wayne should have asked Hank for a lot more than $$10.$