一道题意不理解的题目

230. In an effort to reduce their inventories, Italian vintners have cut prices; their wines have been priced to sell, and they are.
(A) have been priced to sell, and they are
(B) are priced to sell, and they have
(C) are priced to sell, and they do
(D) are being priced to sell, and have
(E) had been priced to sell, and they have

The answer is C.
有解释说最后一个they是指代wine的。
their wines are priced to sell, and they do

这句话的意思不是很明白，有人解释下吗？