Appliance Co sent a fax to a department store, intending to enter into a sales contract for television (TV) sets. Which of the following can be considered to be an offer?
A. 50 TV sets at a price of RMB 3,000 yuan each, please confirm within three days
B. 50 TV sets at a price of RMB 3,000 yuan each, please confirm but subject to our final decision
C. TV sets at a price of RMB 3,000 yuan each are available
D. 50 TV sets are available at a very attractive price, immediate delivery