A Lent Money to B in 1950 Payable in 1951

A lent money to B in 1950 payable in 1951. Despite demand, B failed to pay. In 2011, his daughter who recently became a lawyer sent a demand for payment to B who sent a letter acknowledging the debt and asked for one (1) year to pay but failed to pay within the extended period. A filed a complaint for sum of money. How do you think the court will decide?

A) Dismiss the action due to prescription.
B) Dismiss due to laches.
C) Decide for A because there was a waiver of prescription acquired by B. (Art. 1112, NCC) .
D) Dismiss on the ground of estoppel.