PLEASE ANSWER THE PLEASE :((

21.A contract may be enforced by or against a third person, EXCEPT:

A)When a third person induces another to violate his contract.

B)In case of contracts intended to defraud creditors.

C)When the benefit to the third person is merely incidental.

D)In the case of stipulation pour atrui.

22.It is a contract by virtue of the terms of which the parties thereto promise and obligate themselves to enter into another contract at a future time, upon the happening of certain events, or the fulfillment of certain conditions.

A)Contract of sale.

B)Auto-contract.

C)Contract of option.

D)Contract of adhesion.

23.It refers to a contract wherein one party imposes a ready-made form of contract, which the other may accept or reject, but which the latter cannot modify.

A)Aleatory contract.

B)Auto-contract.

C)Contract of adhesion.

D)Innominate contract.