The agricultural explosion in the South and West and the textile boom in the North strengthened the economy in complementary ways. ...
The rapid development and westward expansion during the Market Revolution resulted in land speculation which caused economic boom and bust.
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Answer:
On July 26, 1948, President Harry S. Truman issued Executive Order 9981 establishing equality of treatment and opportunity in the U.S. military regardless of race. He appointed the President's Committee on Equality of Treatment and Opportunity in the Armed Services, two of whose five members were African American.
"Dry" meant that the cities had severe water shortages and restricted water usage.
Slaves worked for free and had to do all hard labor that they were told to do
The best answer is option C. This option is the one that includes the information given in the original sentence, but summarized (avoiding giving extra information about what marine algae are, or using complicated grammatical structures.)
Option D is quite short, but summarizes the main idea of the original sentence without giving any extra information at all.
None of these two options (C and D) change the overall meaning of the original sentence, but one of them (C) gives the reader more information about the points mentioned in the original sentence ("<em>more than all of the earth plants and trees combined</em>"), different from the other option (D) which goes straight to the point thorugh the use of a simple sentence.