Question

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 slowe
• B. Interior, which travel mostrapidly 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 slowe
• E. Interior and that travel most rapidly through cold, dense regions and slower

Answer 1

The correct option is C Interior, traveling most rapidly through cold, dense regions and more slowly

Looking at the sentence. it seems as if that 'most' is misplaced in the context. 'Most' should appear after 'travelling' as travelling applies to both 'most rapidly' and 'slower'. Also, if the adverb 'rapidly' is used, it is better to use 'slowly' as well. Option C corrects all the errors of the sentence as opposed to the other options which either add other grammatical errors to the sentence or render a different meaning to the sentence. C avoids all these and therefore is the correct choice.