【正确答案】 C

【答案解析】Logical predication; Rhetorical construction
The point of the sentence is that confining babies can inhibit muscle development. As it is written, however, muscle development is the subject of the sentence, and the sentence appears to be saying that muscle development confines babies much of the time. Furthermore, the passive construction can be inhibited could even be seen as illogically suggesting that inhibiting development is the purpose of confinement. The sentence can be expressed more clearly and concisely by making confining the subject of the verb can inhibit, confining babies. .. can inhibit muscle development.
A The intended meaning of the sentence is obscured. The sentence appears to indicate that muscle development confines babies much of the time, which surely is not what is intended.
B The antecedent of their should be babies, but given that babies comes far after the pronoun, the reader is liable to take the antecedent of their to be child development specialists.
C Correct. The sentence clearly and concisely indicates that confining babies... can inhibit muscle development.
D The word babies is the subject of the verb can inhibit, suggesting incorrectly that babies inhibit their own or someone else's muscle development.
E This sentence uses an awkward and wordy construction to indicate that the sites of confinement can result in muscle development being inhibited, when in fact the confinement itself is the cause.
The correct answer is C.