To map Earth’s interior, geologists use a network of seismometers to chart seismic waves that originate in the earth’s crust and ricochet around its interior, most rapidly traveling through cold. dense regions and slower through hotter rocks.

A. interior, most rapidly traveling through cold, dense regions and slower

B. interior, which travel most rapidly through cold, dense regions, and more slowly

C. interior, traveling most rapidly through cold, dense regions and more slowly

D. interior and most rapidly travel through cold, dense regions, and slower

E. interior and that travel most rapidly through cold, dense regions and slower

Although OA is C, but I cannot figure out why option E is incorrect. It uses parallel ‘that’ structure and is grammatically correct.

It is difficult to find out whether the type of travel mentioned is due to ricochet effect or independent of that effect. How can one be sure that we have to use modifier in the last part of the sentence ?