Gregg Biglieri Moves into a Tough Philadelphia Neighborhood and Opens

Gregg Biglieri moves into a tough Philadelphia neighborhood and opens a repair shop.He is harassed by the local gang leader who wants to extort money from him.He promises to pay Johnson,a police officer whose beat includes Gregg's store,$50 a week to "keep an eye on the store" while walking his beat.Which of the statements is true with respect to Gregg's situation?

A) The local gang leader will keep his promise of not harassing Gregg for money as long as Gregg pays him $50 a week.
B) The cop can sue Gregg for not keeping his promise of paying 50$ per week.
C) Johnson being a public officer,his duties towards Gregg is not consideration.
D) In this case,Gregg is the promisee and Johnson is the promisor.