It would be that "d. Muhammad was engaged in long-distance trade where he came into contact with monotheists" that likely would have influenced his acceptance of monotheism, since this allowed for him to gain new and challenging points of view.
When Christopher Columbus landed in the Caribbean, he "discovered the Americas"
This is because it was after Christopher Columbus landed in what is the modern-day Bahamas in 1492, that is when Europe and the rest of the world began to know more about the continent of America.
- Option D is not correct because Colombus is not the first person to set foot in the Western Hemisphere, rather it was a group of Vikings led by Leif Erikson about 500 years before Colombus.
- Also, option B is not correct, because he was not generous to the native people he met there. Rather he exploited them, and through his expedition, the transatlantic exploitation started.
- Option A is also wrong as well. This is because he did not connect the Americas to Europe and Africa by sea. Rather it was some other European slave traders that specifically the Portuguese that did that.
Hence, in this case, the correct answer is option C. "discovered the Americas."
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Slavery helped out the class structure in the South by helping people become more dependent and more supportive of what they need.