SC大全SECTION-B-17探讨 请教

During the first nine months of 1979, textbook publishers incurred substantial costs for creating products that, due to a decline in public funding for instructional material, never were sold.
(A) funding for instructional material, never were
SECTION B 431
http://www.chasedream.com/ by Gemj
(B) funding for instructional material, never was
(C) funding, the instructional material, was never
(D) funding for instructional material, the products were never
(E) funding, they were never

why A is right?Never will be a subject in the clause?

Any explaination will be highly appreciated!

考点：谓语的单复数

提干：textbook publishers incurred substantial costs for creating products that never be sold

sold前面的be动词是products的谓语，所以必须用复数

BC排除

DE选项中的 the products were never/they were never有了主语和谓语，单独成句，那么题目中的前半段则没有谓语。错

选A