Which of the Following Statements About an Option Is Not

Which of the following statements about an option is not true?

A) An option agreement must be written and can only be valid for up to 12 months.
B) An option can be described as 'a contract before a contract'.
C) An owner of property who enters an option agreement to sell it is legally bound by the agreement.
D) An owner of property who enters an option agreement usually agrees to sell it at an agreed price in an agreed period of time.