Under Indian Contract Act, which of the following contracts is not a valid contract?
A. By a written registered document A promises to give Rs. 5000 to B for natural love and affection
B. By an oral agreement B agrees to pay time barred debt of A
C. A went on a pilgrimage, B paid his electricity bills A agrees to pay back the amount paid by B to him
D. A supports B's infant son, B promises to pay A's expenses in so doing
Answer: Option B

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