They explored and colonized in North America mainly for Gold
Because that way, every one can see what the person is doing, his records, and stuff like that.
also, so that the person would not be lying to the court, they would know for sure, what and where this all happened.
Hope that this would help you!!
=)
The answer is most likely D
Explanation:
I used my best judgement to answer this as well as process of elimination, I immediately eliminated b and c. then it was between a and d for answers. I thought D made the most sense from what I know about ancient civilizations, and prehistoric history.