Change the negative sentence into an affirmative, without changing its meaning:
The patient was not strong enough to open his eyes.

We know from the hint given to United States that, Associate in Nursing affirmative sentence could be a cluster of positive words, that is, there are not any negative words. A negative sentence may be born-again to Associate in Nursing affirmative sentence by the removal of the negative word(s). The negative words area unit removed by work Associate in Nursing applicable word that doesn't alter the that means or context of the sentence. Hence, to alter the negative sentence given to United States within the question to Associate in Nursing affirmative sentence, we tend to simply got to establish the negative word and substitute it with an appropriate positive word.
We observe that ‘not’ could be a negative word that's gift within the sentence. so as to substitute it with a positive word, we tend to should notice a word which means, ‘not robust enough’, that is that the opposite of being robust. From the hint given to United States, we all know that the other of robust is weak. Hence, possibility A is correct.
We observe that possibility B includes a negative word ‘not’ and thence it's wrong. we tend to conjointly observe that possibility C is Associate in Nursing affirmative sentence. However, it doesn't convey a similar that means as that of the sentence given to United States. Hence, possibility C is inaccurate.
Option D is inaccurate as possibility A is that the correct answer.