In Which of the Following Situations Have Both Parties Given

In which of the following situations have both parties given consideration to support a contract?

A) Pat,an accounting professor,agrees to tutor one of her students in the study of French for $10 per hour.
B) Pat,a police officer,agrees to patrol someone's neighborhood while on duty for $100 a week.
C) Pat,because of the great job that a contractor did in building an addition onto her house last year,promises to give the contractor an extra $1,000.
D) Pat promises to give her mother $100 per month for the next 10 years for all the work that her mother did in raising Pat.