Tough one. This question is about parallelism.
Agricultural scientists continue to search for a strain of wheat that is hardy, disease-resistant and yields
more grain per acre.
A.hardy, disease-resistant and yieldsWrong.
Because "hardy" || disease-resistant, so there should be "and" between "hardy" and "disease-resistant" to make the parallel structure clear.
B.hardy, resists disease, and that yieldsWrong.
If "that is"|| resists || yields ==> the second "that" is wrong. The correct structure should be: a strain of wheat that is hardy, resists disease and yields.....
C.hardy and disease-resistant and that yieldsCorrect.
"hardy" || "disease-resistant;
"that is ...." || "that yields
D.hardy and resist disease, yieldingWrong.
"a strain" is singular ==> "resist" is wrong. Should be "resists".
E.hardy, disease-resistant, and yieldingWrong.
Although the structure is parallel, the meaning is wrong. "Hardy" and "disease-resistant" are characteristics of the strain of wheat, but "yielding" is the advantage of the grains, so we cannot put them together in a parallel structure.For example:
My professor who is tall, black-hair and who teaches math is very smart.
We can put "tall" and "black-hair" in one parallel structure, but cannot put "tall" + "black-hair" + "teach math". They are in different categories.
Hope it helps.
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