parasma
The justification provided for rejecting the option "C " is not sufficient.
If we go by meaning, option C is describing clearly that theory is allowing the scientist to explore the possibility.
Meaning of the original sentence is also stating the same that this theory allows the scientists for doing something and moreover 2nd clause do not provide the reason- Why does this theory is gateway of innovations?"
@Daag
Can you help us to understand please?
I completely agree with above 3 users. In fact, I don't see an effective reason to cancel out any of options a, b, & c.
Too formal is the reason against option A? Such explanations, even though official, don't help and confuse us more.
"it" doesn't have an ambiguous antecedent. However, option B & C conveniently accept and ignore its existence as needed.
Requesting someone to look into this.
or else drop the question. What's the point of keeping a question, if we are not learning anything from it.