Which problem could be solved using this equation? 12x + 3 = 39

A. Three eggs fewer than some dozen make a total of 39 eggs. How many dozens are there?

B. Three inches and some number of feet have a total measurement a of 39 inches. How many feet are there?

C. One dozen regular milk cartons and some 3-packs of chocolate milk make a total of 39 cartons. How many 3-packs are there?

D. An order with 12 books and 3 magazines is in a box of 39 items. How many other items are in the box?​