Answer:
E. Both B and C are correct.
Step-by-step explanation:
Sentences B and C are the correct sentences.
B. The sheer cost of hospital-acquired infections is enough to warrant a solution.
C. The high cost of hospital-acquired infections is enough to warrant a solution.
The use of punctuation marks, the spellings make them the right choice. Also, the words "sheer" and "high" are similar in the sense that "sheer" is an adjective that means extreme.
However, the other two options of A and D are wrong for-
1. the spelling of sheer is wrong in option A. (shear)
2. the position of the commas (,) in the sentence (cost, infections,) are wrong.