In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option ‘No improvement’.
They could be used only defensive to girdle a single planet in the stratospheric level of its atmosphere.
A. Be using only as defense
B. Been used only as defensive
C. Be used only defensively
The sentence uses the form be used only defensive$, which is incorrect and needs improvement.
Since the word 'defensive' comes after the verb 'used', it must be in its adverb form 'defensively'.
The only alternative that improves the sentence is C.
None of the other alternatives can make the sentence meaningful.
Therefore, the correct answer is option 4.