4. Eight friends went to a restaurant for a meal, and the cost was to be shared equally among them. Because Judy forgot to bring money, the other seven friends each paid an extra 2.50 yuan. Therefore, the total cost of this meal was ( ) yuan.
(A) 120
(B) 128
(C) 140
(D) 144
(E) 160
4. C.

In fact, Judy should pay $2.50 \times 7 = 17.50$ yuan.
Since the meal cost is shared equally, each person pays 17.50 yuan.
Therefore, the total cost of the meal is $17.50 \times 8 = 140$ yuan.