Believed to originate

[ektamatta]

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

OA is C

[vittalgmat]

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

OA is C

Hi,
I would appreciate if someone can comment on why is B incorrect??.
I figured out that there are many pronouns which dont necessarily refer to the correct noun. But I would like to get some explanation.

thanks
-Vittal

[chidcguy]

D is wrong because first half of the sentence before ; cannot stand by itself

E is wrong as it uses passive voice and also starts with originating which makes it awkward

A says that Elephants are believed to originate from a small area on their foreheads

B uses they may use this. its not clear what they is referring to here as we have elephants, low frequency sounds which are plural. This refers to plural low frequency sounds.

C
Elephants emit low-frequency sounds that they may use as a secret language to communicate with other members of the herd. (with out the phrase in between)

[agent47]

I think C is correct can some one explain