paes wrote:In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing many more prescriptions for higher-cost drugs.
A. a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing
B. a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing
C. a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written
D. which occurred not just because drugs are becoming more expensive but doctors are also writing
E. which occurred not just because of more expensive drugs but because doctors have also written

[spoiler]OA Later, but I have following doubt, please clarify.
In A/B/C : 'A phenomenon' is a noun modifier, so it should modify to nearest noun (drugs, in this case)
How it can modify to a complete clause.
[/spoiler]

papgust wrote:"A phenomenon" is an abstract noun. As it modifies the preceding clause, it refers back to the whole idea of the preceding clause, not the immediate noun before the comma.

You may look into this post for more details,
https://www.beatthegmat.com/papgust-s-gm ... tml#261630

ansumania wrote:what is wrong with C though..........