Julie Posts a Letter to Ruth Offering to Sell Her

Julie posts a letter to Ruth offering to sell her a mountain bike worth $1000 for $750 if she 'accepts within a reasonable time by return mail'.Ruth posts back an acceptance the next day.Unfortunately,Julie never receives the letter.When Ruth finally contacts Julie two weeks later,Julie says that as she did not receive the letter she is not legally obliged to sell the bike for $750.Which statement best explains Ruth's legal position?

A) A contract was made on the day Ruth received the offer and decided she would accept it.
B) A contract was made five working days after the letter was posted.Under common law,letters are deemed to have been delivered in that time period.
C) A contract was made when Ruth posted the letter.
D) A contract was not made because Julie never received Ruth's letter.