Harry Styles sends an offer by mail to Olivia Wilde offering her an opportunity to buy his Grammy. Olivia, in a heap of excitement, sends a beautifully written acceptance letter through the mail back to Harry. When is acceptance effective?

A. Immediately when Olivia puts her letter in the mailbox
B. When Harry calls to tell Olivia that he got her letter
C. When Harry receives Olivia's letter in the mail
D. When Harry sends the Grammy to Olivia through the mail after receiving her letter.

An offeror can still revoke his offer during an active Option Contract as long as he does so before the offeree exercises the Option.

A. True
B. False