I think the correct answer would be C. The best summary of the text "Save the Coral Reefs" would be
Construction along the coasts, overfishing, and bleaching have seriously damaged the world’s coral reefs. Since reefs are a very important part of the ocean’s ecosystem, their destruction has a devastating environmental impact, and we must work to protect them.
Coral reefs are known to be very fragile which are made of limestone. People who would build coastal regions and those who overfish should be stopped as these activities ruin and damage the corals which would ruin the habitat of the fishes and other aquatic organisms.
IT MIGHT NOT CAUSE A SEQUENCE.YOU NEVER KNOW
Where the comma should go in the sentence
<span>it's easy to take certain freedoms for granted: freedom of speech, freedom of religion, freedom to wear white shoes after Labor Day. Many times, we don't notice our freedoms until they're gone. This is what happens to the people of Iran in the 1980s, when Marjane Satrapi's story begins. Revolutionaries who speak out against the regime are executed; everyone is expected to dress as though they are Muslim fundamentalists, especially women who need head-to-toe coverings and a veil.</span>
