Sentence Correction

Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used as a secret language to communicate with other members of the herd.
(A) Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used
(B) Elephants emit low-frequency sounds that are believed to originate from a small area on their foreheads, and they may use this
(C) Elephants emit low-frequency sounds, believed to originate from a small area on their foreheads, that they may use
(D) Originating, it is believed, from a small area on their foreheads; elephants emit low-frequency sounds they may use
(E) Originating, it is believed, from a small area on their foreheads, low-frequency sounds are emitted by elephants that may be used

ANS: C

A has modifier error.
B: the use of last word "this" to refer plural "sounds" makes the choice wrong.

C is correct and error free.
D and E arewordy construction.

Can you explain where the modifier error in choice A is? I can't spot it, and I'm interested.

Believed to originate....elephants emit low-frequency sounds that may be used...

What is beleived to orginate..Elephants????

Am I correct?

Ha! You totally are! Thanks. (plus I had a laugh, which is a bonus )