There are many food carts near Mark’s university. Mark and his friends regularly buy hot dogs from Jeff’s cart. Recently, Andrea opened a business selling two-for-one hamburgers near Jeff’s cart. What will be effect on Jeff’s hot dog cart?
A.demand for his hotdogs will increase.
B.supply of for his hotdogs will decrease.
C.supply of his hotdogs will increase.
D.demand for his hotdogs will decrease.