Answer:
C is the correct answer.
Step-by-step explanation:
There isn't a mistake in this sentence.
Number one is incorrect because the position of the adverb clause doesn't modify the meaning (at least as how the sentence is written.)
Number two is incorrect because the modifier is placed properly and doesn't make the sentence difficult to understand.
Number 3 is also incorrect because the lack of parallel structure doesn't affect the meaning of the sentence.
Number 4 is also incorrect because of the same reason as number two.
Due to this, number five (letter C) is the correct answer.