【单选题】Kelly mails to Pat an offer to sell Pat her computer, stating that Pat has thirty days to accept. Pat immediately mails a letter of rejection. After reconsidering, Pat mails a letter of acceptance wit...
A.
The rejection is effective because Pat mailed it first.
B.
The acceptance is effective if Kelly receives it first.
C.
The acceptance has no effect, because a rejection when mailed voids a deal.