I thinks it's B but C can also be an answer but I would go with B
Answer: reexamine is the answer.
Some internet sources are not reliable that anybody can edit i would say some examples but i can not state them here,
your answer is the second one i think
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<span>Royalty there demanded protection from the sun, and people developed the umbrella for this purpose.
In these sentences, the creation of the umbrella happened for a very specific purpose. Using the conjunction "and", following the reason for its creation helps to connect the two events clearly. </span>
