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I'd like to ask why the answer is (b) in the following question.
There was the question #1 in the exercise to fill in the blank.
#1 The function of space suit is ( ).
Choices are (a) keeping the wearer safe (b) to keep the wearer safe
The answer was (b).
I cannot understand why (a) is wrong. A gerund can be used as a noun. So I think both can be the right answer.
Is there a special rule that gerund cannot be a complement?
Would you give me some guidance?
Why is the answer this? 
Re: Why is the answer this? 
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