问一道填空机经题

As cheaper imports drove most California potteries out of business during the 1950s, one company (i)______. The substantial size and weight of the specialized products produced by Architectural Pottery helped (ii)______ the company, because it was uneconomical for foreign companies to ship similarly large objects to California.

Blank (i) Blank (ii)
A. stagnated D. transform
B. diversified E. insulate
C. flourished F. finance

答案是CE，我不明白为什么是E。谢谢了！