45. S1. "I will give you P1,000 if you pass the Oblicon exam." If on the examination day I gave you a spoiled milk to make you sick thus preventing you from taking the exam, my obligation is extinguished because you cannot pass the exam anymore. S2. "I will give you P1,000 if I like". The court may fix the duration of the period because it is dependent upon the will of the debtor.*

(A) both are true

(B) both are false

(C) only S1 is true

(D) only S2 is true

Brief explanation will do. Thanks!