Pastoralism persisted in areas that could not sustain long-term agricultural pursuits, such as areas with unfavorable climates and unreliable sources of pastures, food sources, and water
Pastoralists we're vital in the spread of technological innovation between different agricultural communities as they moved between settled populations.
The people who would most likely support imperialism here would be capitalists and the media. Capitalists because they can produce much higher amounts of goods for a much lower price - exploiting the local population, and the media because they have stories to talk about which sell :)
I believe the answer would be D (all of the above).