It's D (apex). They thought that it was fine as it was.
The answer is a. All you have to do is place the word in and see if it sounds right.
Answer:
the correct answer is A
Explanation:
The fact that studies have been done to document the effects of acupuncture is correct. None of the other choices, though they are included in the article, provide evidence that can be accounted for . They merely provide information to help readers understand what it was not how it actually worked
The answer is C. This is because but is being used as a conjunction separating independent clauses in the other answers. You can remove but from A, B, and D, and you are left with 2 simple sentences.
I hope this helps!!!
