Question #N974

A scientist is writing about the process of photosynthesis. Which choice best completes the sentence so that it conforms to the conventions of Standard English? The process of photosynthesis occurs in plants, algae, and some bacteria, which use sunlight to produce energy from carbon dioxide and water. ______, the resulting energy is stored in the form of sugar, which the plant uses to grow.

Which transition best completes the sentence?
A. Consequently
B. However
C. Moreover
D. Therefore

Correct Answer is: D

The transition "Therefore" is the best choice because it shows a cause-and-effect relationship between the previous clause and the following clause. The previous clause explains the process of photosynthesis, and the following clause explains the resulting consequence of the process. The other transitions do not show this cause-and-effect relationship as well. "Consequently" suggests that the following clause is a result of the previous clause but does not emphasize the cause-and-effect relationship as clearly as "Therefore." "However" suggests a contrast between the previous clause and the following clause. "Moreover" adds additional information to the previous clause, but it does not indicate a cause-and-effect relationship.