Satellite radio transmissions, a popular feature in car stereos, differ from those of AM and FM radio, which is sent directly from earthbound towers and then to a car stereo.


A) which is sent directly from earthbound towers and then to a car


“which” refers to transmissions from AM and FM radio. We need to use the plural verb- “are” and not “is” to refer to the plural noun- transmissions.

We need to use the use the possessive noun- car’s stereo. 


B) which are sent directly from earthbound towers to a car's

Both the errors in option A are corrected in Option B.

B is correct.


C) sent from earthbound towers and then directly to a car

We need to use the use the possessive noun- car’s stereo. 

From earthbound towers to a car’s stereo is the correct idiomatic usage. 


D) sending them directly from earthbound towers to a car’s

“ing” modifier distorts the meaning of the sentence. 


E) being sent directly from earthbound towers to a car

We need to use the use the possessive noun- car’s stereo. 

The modifier- “being sent” distorts the meaning of the sentence.