X' on 1^st July, 2018 agrees to sell his house to 'Y' for a price of Rs. 1 crore, if the entire price is paid on or before 31^st July, 2018 and for the price of Rs. 1,25,00,000/- after 31^st July, 2018 but before 30^th September, 2018. It was further agreed that if the entire price is not paid by 30^th September, 2018, 'Y' shall not be entitled to purchase the house and the earnest money paid by 'Y' to 'X' shall stand forfeited. Such an agreement:

A. Is void for uncertainty

B. Is void because the meaning of it is not certain on account of being by way of wager

C. Is enforceable in law

D. None of the above

Answer: Option C