Exposure to air pollution may amplify the risk of developing

IMO A

A) Exposure to air pollution may amplify the risk of developing blood clots; one reason is suggested by the finding that small particulates that enter the bloodstream from the lungs cause blood cells to coagulate more readily. - correct. the semicolon is correctly placed between two independent clauses that have a subject and a verb.this answer choice provides information in the most concise and clear way of all answers.
(B) Entering the bloodstream from the lungs, one reason that exposure to air pollution may amplify the risk of developing blood clots is suggested by the finding that small particulates cause blood cells to coagulate more readily. - one reason does not enter the blood stream - misplaced modifier.
(C) Entering the bloodstream from the lungs, one reason exposure to air pollution may amplify the risk of developing blood clots is suggested by the finding that small particulates cause blood cells to coagulate more readily. - same as B
(D) The finding that small particulates cause blood cells to coagulate more readily is suggestive of one reason, entering the bloodstream from the lungs, exposure to air pollution may amplify the risk of developing blood clots. - wordy and awkward
(E) The finding of small particulates entering the bloodstream from the lungs and causing blood cells to coagulate more readily suggests one reason exposure to air pollution may amplify the risk of developing blood clots from blood cells. - wordy and awkward

What's the OA?