Wouldn't you think that after the wheel was invented, wheel technology would have taken off? Especially after a few thousand years?... But the early wheel had limitations. In places like the Middle East and North Africa, camels were already an easy and fairly reliable way to get around (even if they do like to spit all over their riders). But early wheels required flat and stable surfaces. Sand or uneven or wet terrain could sink a wheel and leave a person stranded.

Why did the author include this passage?
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A To tell why camels were often the only possible way to travel in the Middle East and Africa
B To show that wheels can only be used on flat, stable surfaces, not on sand or uneven terrain
C To explain why it took so long for wheels to become widely used for transportation
D To describe how difficult it was for people in the Middle East to find a reliable way to travel