Let's analyze each statement based on the Indian Contract Act, 1872.
(A) is true.
This is the essence of Section 30, which deals with wagering agreements.
(B) is true.
This is the principle laid down in Section 41 regarding the effect of accepting performance from a third party.
(C) is true.
This is the rule stated in Section 50 regarding the manner and time of performance.
(D) is false.
This statement is directly contradicted by Section 65, which establishes the principle of restitution.
Section 65 states that when a contract becomes void, any person who has received any advantage under it is bound to restore it, or make compensation for it, to the person from whom he received it.
Therefore, the statement that is not true is (D).