What kind of defective contracts are the following? Why?

21. An oral pre-nuptial agreement.

22. A verbal contract of sale of a cellular phone worth P1,000.00 when no payment and delivery have yet made.

23. A verbal executory contract of lease of a boarding house for a term of two years.

24. A verbal contract of sale of farmland for P50,000.00 when no payment and delivery have yet made.

25. A written contract of sale of a laptop computer between a 25 years old and a 17 years old.

26. A written contract of sale of a motorcycle between a 25 years old and a drunk 20 years old.

27. A written contract of sale of a house and lot between a 45 years old demented person who acted during lucid interval and a 50 years old under hypnotic spell.

28. A written contract of sale of a fishpond where the seller's consent was obtained through intimidation.

29. A contract where the debtor forced the creditor to loan him P10,000.00.

30. A contract where a teacher unduly influenced his student to give his cellular phone to him.

Choices:

A. Rescissible

B. Voidable

C. Unenforceable

D. Void or Inexistent