Richard Wants to Hire Sam to Mow Richard's Lawn Every

Richard wants to hire Sam to mow Richard's lawn every week for the summer.Richard writes up the offer on June 1.In his offer,Richard specifies that Sam must accept the offer within five days.Richard signs the offer on June 2 and mails it to Sam on June 3.Sam receives the offer on June 4.Sam's five day acceptance period began on

A) June 1.
B) June 2.
C) June 3.
D) June 4.