A Professor Tells a Student That If She Writes a 5,000

A professor tells a student that if she writes a 5,000 word paper on the evils of plagiarism by May 13^th,he will pay the student $750.00.

A) the offer is for a unilateral contract
B) if the student gives the paper to the professor on May 14^th, the money is owed because the student came close and did get the paper done
C) this contract is only enforceable if it's in writing
D) this contract is only enforceable if the student verbally or in writing accepts the offer prior to beginning the paper