On September 27, Luisa sent Fox a letter offering to sell Fox a vacation home for $150,000. On October 2, Fox replied by mail agreeing to buy the home for $145,000. Luisa did not reply to Fox. Do Fox and Luisa have a binding contract?
A.
No, because Fox's letter was a counteroffer.
B.
No, because Fox failed to sign and return Luisa' letter.
C.
Yes, because Luisa's silence is an implied acceptance of Fox's letter.
D.
Yes, because Luisa's offer was validly accepted.