The correct answer is Valid Contract INDIAN CONTRACT ACT 1872Section 10 of Indian Contract Act 1872:All agreements are contracts if they are made by the free consent of parties competent to contract, for a lawful consideration and with a lawful object, and are not hereby expressly declared to be void.Section 11 of Indian Contract Act 1872:Every person is competent to contract who is of the age of majority according to the law to which he is subject1, and who is of sound mind and is not disqualified from contracting by any law to which he is subject.Important Points Section 10 of Indian Contract Act 1872 says that the parties should enter into contract with free consent. In the above question, without any pressure, B takes a joint undertaking for consent, then it is a valid contract.Section 11 of Indian Contract Act 1872 says a minor who has not obtained the age of 18, cannot enter into contract. Any contract with minor is void.In the above question, at the time of giving consent to "B", 'A' is not a minor. At the time of giving consent, he has obtained majority. Hence, this contract is valid. ?'A' Minor takes a loan of Rs. 4,000/- from 'B' during his minority, on attaining majority, he applies to 'B' for a further loan of Rs. 3,000/- 'B' gives this loan and obtains from 'A' a combined promissory note of Rs. 7,000/- for the two loans. This is considered as Valid contract.