Travel Lines Offered to Sell 10 Round-Trip Tickets to Elaine

Travel Lines offered to sell 10 round-trip tickets to Elaine. Travel Lines stated that the acceptance must be in writing by USPS next-day service. Which of the following acceptances will create a contract between Travel Lines and Elaine?

A) Elaine calls Travel Lines and states that she will buy the tickets.
B) Elaine sends a fax to Travel Lines stating she will buy the tickets.
C) Elaine sends a letter by USPS next-day service to Travel Lines stating that she will buy the tickets.
D) All of these responses will create a contract between Travel Lines and Elaine since they constitute reasonable means of communication.