Question: A woman awoke one morning to discover that someone had vandalized her home during the night. The woman then published the following notice in the local newspaper:"REWARDAny person who supplies information leading to the arrest and conviction of the person who vandalized my home, located at 1223 1st Street, will be paid $5,000. "The reward notice in the local newspaper proposed a
A: unilateral contract only.
B: bilateral contract only.
C: unilateral contract or bilateral contract, at the offeree's option. 
D: unilateral contract that ripened into a bilateral contract when someone supplied the information leading to the vandal's conviction.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.