if you have "preposition + NOUN + VERBing", then "VERBing" is just a modifier, and can be dropped without changing the surrounding grammar.
therefore, the sentence should still make sense, in context, if you write it as just "preposition + NOUN", without the "VERBing" modifier.
therefore, the sentence at hand can be reduced to "... results in the act of stinging".
that's incorrect -- the act of stinging is not the result here;
you can only say "X results in Y" when X is an ACTION. if X is an OBJECT, you can NEVER say that X "results" in anything.
this kills choices (c) and (d), in which "stinger" is the subject of the verb "results".
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if you have "preposition + NOUN + VERBing", then "VERBing" is just a modifier, and can be dropped without changing the surrounding grammar.
therefore, the sentence should still make sense, in context, if you write it as just "preposition + NOUN", without the "VERBing" modifier.
therefore, the sentence at hand can be reduced to "... results in the act of stinging".
that's incorrect -- the act of stinging is not the result here;