【正确答案】 A

【答案解析】Logical predication; Agreement
The point of the sentence is that there is great variation in projections of how the storms that it refers to will grow. The structure of the sentence makes it clear that the variation is in the computer models' projections.
A Correct. The sentence explains concisely that growth projected in different weather models varies widely.
B Growth for these storms is unidiomatic and unclear. The construction growth ... is projected... to vary makes it unclear whether the models project widely varying growth or vary in how much growth they project.
C The construction growth ... vary widely places the variation in the growth of the storms rather than in the projections. The plural verb vary does not agree with the singular subject growth.
D If growth projected for these storms is taken as the subject of the sentence, the subject is not paired with a verb and the sentence is grammatically incomplete.
E The phrase growth that varies widely indicates that the variation is in the growth of the storms rather than in the projections. The plural verb are projected does not agree with the singular subject growth.
The correct answer is A.