Amrita offers to sell Sandeep her car for a $10,000 lump sum by cash payment. Sandeep accepts and responds that he will pay by five instalments of $2,000. Amrita then sells the car to another party. Amrita's original offer to Sandeep will not be enforced because:

a. there has been a counteroffer that terminated Amrita's original offer.

b. Amrita's sale of the car constituted termination without notice.

c. they did not have a contract in writing.

d. Amrita never intended to sell the car to Sandeep.