Carrie and Peter Enter into a Contract in Which Carrie

Multiple Choice

Carrie and Peter enter into a contract in which Carrie agrees to wash Peter's car once a week as long as Peter tutors Carrie's son in math and Peter never comes home with a grade below B+.This is an example of which type of conditional contract?

A) Condition Subsequent
B) Implied condition
C) Condition Concurrent
D) Condition Precedent
E) The contract is not conditional.