Drew is devastated when his dog, Loki, goes missing. Drew posts flyers offering a $$100$ reward for the return of Loki. Divit sees a flyer, goes to Drew's home with the flyer, and tells Drew, "I am going to find Loki for you. I won't rest until he is found. Give me the $$100$ reward." Does Drew have to give Divit the $$100?$

a$.$ Yes, because Drew made a valid offer,

b$.$ No$,$ because this is a voidable contract.

C$.$ No$,$ because this is a unilateral contract that may only be accepted by performance.

d$.$ Yes, because this is a bilateral contract.