Mindy says to her friend Shelly, "Do you want to buy my red leather sofa for $75.00?" Shelly says, "Maybe, I'm not really sure if it will fit in my new place. How about I let you know in two weeks?"
a) Shelly has killed the offer because she hasn't immediately accepted, and the offer is not coming back.
b) The offer is open and can be accepted at any time because it is between friends.
c) None of the listed answers are correct.
d) The offer is open and can be accepted in two weeks.