Understand how technology and other
factors contributed to the spread of
imperialism.

In the late 19th century Europeans have expanded their imperialism due to sofisticated technology they applied into several aspects around the world.

Explanation:

One of the most controversial issues about technology, it's the way Europeans have spreaded their imperialism through new proven technology.

It has affected all types of coutries at all levels. Many governments have announced their deep concerns about this new way of imperialism.

I believe the answer is: a. Most Europeans are employed in the mining industry.

The most employees during that time work in either railroad and automobiles industry. Since a lot of them used product from the mining industry, people often mistake them. The industry started to shifted from railroad into textile and consumer goods in the mid 1900s.