Yee offered to sell equipment to Chang for $$4000,$ but Chang counteroffered with a price of $$3500,$ as long as Yee would deliver it$.$ Yee rejected Chang$$s counteroffer. What is the effect of Chang$$s counteroffer on Yee$$s original offer?

Question $7$ options:

a$)$

Yee's original offer is still available for acceptance until Yee specifically revokes it$.$

b$)$

Yee's original offer is no longer available because it has lapsed.

c$)$

Yee's original offer is no longer available for acceptance because Chang's counteroffer ended the original offer.

d$)$

Yee's original offer is still available because she has not replaced it with a new offer.