THE CORRECT ANSWER IS (D). THE WORDS EXAMINATION, DIAGNOSING, AND...

21. The correct answer is (D). The words examination, diagnosing, and treatment are not

all grammatically parallel. One solution is to replace diagnosing with diagnosis. Also,

the first clause seems to refer nonsensically to patients because of this word’s proximity

to the clause. The solution is to reconstruct the sentence so that the clause is closer to

physicians than to patients. Choice (D) is the only alternative that corrects both

problems without creating any new ones.