Critical Reasoning

To protect certain fledgling industries, the government
of Country Z banned imports of the types of products
those industries were starting to make. As a direct
result, the cost of those products to the buyers,
several export-dependent industries in Z, went up,
sharply limiting the ability of those industries to
compete effectively in their export markets.

Which of the following conclusions about Country Z's
adversely affected export-dependent industries is best
supported by the passage?

(A) Profit margins in those industries were not high
enough to absorb the rise in costs mentioned
above.
(B) Those industries had to contend with the fact
that other countries banned imports from
Country Z.
(C) Those industries succeeded in expanding the
domestic market for their products.
(D) Steps to offset rising materials costs by
decreasing labor costs were taken in those
industries.
(E) Those industries started to move into export
markets that they had previously judged
unprofitable.

Any one pls explain why the anwer choice E& B is wrong and what valid reason that make answer choice A as correct answer.