In the process of photosynthesis, plants absorb sunlight and carbon dioxide. The energy from the light converts these inputs until they ______ glucose, a sugar that serves as the plant’s primary energy source.
3
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
will yield
B
yield
C
had yielded
D
are yielding
Correct Answer: B
Choice B is the best answer. The subject of the clause is "they" (referring to "inputs"), which is plural. The sentence describes a general scientific process, so the simple present tense is appropriate. "Yield" is the plural, simple present form of the verb.