Sound can travel through water for enormous distances, prevented from dissipating its acoustic energy as a result of boundaries in the ocean created by water layers ofdifferent temperatures and densities.

A.prevented from dissipating its acoustic energy as a result of

B.prevented from having its acoustic energy dissipated by

C.its acoustic energy prevented from dissipating by

D.its acoustic energy prevented from being dissipated asa result of

E.preventing its acoustic energy from dissipating by

答案貌似是C
但是  我搞不清这整句话的结构。。。。。
请各位帮帮我吖~