Which of the following words, if added to an offer, will cause the offer to fail for definiteness?

A) Friday, as in "I will sell you my boat Friday for $1000"
B)In the future, as in "I will sell you my boat sometime in the future for $1000"
Ci)Might, as in "I might want to sell you my boat for $1000"
D)Tomorrow, as in "I will sell you my boat tomorrow