On February 2, Company A made a selling offer to Company B, "We offer firm at USD 150 per carton FOB Shanghai, subject to your reply here on or before February 10." On February 6, B replied, "Your offer of February 2 is accepted if the price is USD 135 per carton FOB Shanghai." As A was considering, the market price went over USD 150. On February 8, B sent another mail that read, "We accept your offer of February 2." 
Which of the following statements is true?
A、B's reply on February 6 is an acceptance.
B、B's reply on February 6 is a counteroffer.
C、B's mail on February 8 is an acceptance.
D、B's mail on February 8 is a new offer.
E、A contract was concluded between A and B.
F、No contract was concluded between A and B.
G、B's reply on February 6 is a new offer.