Not 100% sure but it might be D.
Answer:
it is d (european countries encouraged imperialism to expand foreign trade in profitable luxury goods) :)
Explanation:
This might could help
http://diy.stackexchange.com/questions/998/what-are-the-different-gauges-of-electrical-wire-availabl...
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wtjfavyw