<em>B. Area near a sea having flat land and low relief</em>
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<em>A coastal plain is flat, low-lying land adjacent to a sea coast.</em>
Right now people live typically in cities which are comparatively old, so the relevant question here is where did people choose to settle in the past.
In the past it was very important for people to live next to water sources- it was a source of drinking water, allowed defence and trade. So the correct answer is "near bodies of water"
Coral reefs provide an important ecosystem for life underwater, protect coastal areas by reducing the power of waves hitting the coast, and provide a crucial source of income for millions of people. Coral reefs teem with diverse life. Thousands of species can be found living on one reef.
