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yes E is best choice. What's the OA bull?

Cheers
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OA, as explained, is indeed .
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E addresses the modifier error. Rest all are ambiguous.
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gmatbull
When children become teenagers, scientists believe that their sense of taste begins to evolve more because
their sense of smell is heightened than because their taste buds change
.

A: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightened
than because their taste buds change
B: their sense of taste evolves, scientists believe, more because their sense of smell becomes heightened than
because of their taste buds changing.
C: their sense of taste evolves, scientists believe, due more to their sense of smell heightening than their taste buds
changing.
D: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightening than
because their taste buds are changing.
E: their sense of taste begins to evolve, scientists believe, more because their sense of smell becomes heightened
than because their taste buds change.

OA
to follow

Ya i agree with u all guys E solves modifier error...

But what about pronoun "their" refer to children/ scientists ?
Is scientists collective noun ?

Also is "scientists believe" Independent clause or modifier ?
Can any one cite on this!!
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gmatbull
When children become teenagers, scientists believe that their sense of taste begins to evolve more because
their sense of smell is heightened than because their taste buds change
.

A: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightened
than because their taste buds change
B: their sense of taste evolves, scientists believe, more because their sense of smell becomes heightened than
because of their taste buds changing.
C: their sense of taste evolves, scientists believe, due more to their sense of smell heightening than their taste buds
changing.
D: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightening than
because their taste buds are changing.
E: their sense of taste begins to evolve, scientists believe, more because their sense of smell becomes heightened
than because their taste buds change.

OA
to follow
Hii.
I'll try to find different errors in the answer choices.
D: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightening than
because their taste buds are changing.

As umeshpatil told, WHEN MODIFIES TIME. So we can't use a helping verb here. Otherwise the sentence becomes like this:
When you look closely at the house, it is on fire.
They are composed of thousands of particles when viewed up close.
Always remember, "when" acts as a modifier in a time frame and it will modify the time frame only.

B: their sense of taste evolves, scientists believe, more because their sense of smell becomes heightened than
because of their taste buds changing.

In a prepositional phrase, noun + Ing form of verb can't co-exist.

what does "scientists believe" modifies. Left side or right side.
This ambiguity remains in correct choice also, hence The correct answer is just the best of the lot but not the ideal.

Rest all mistakes are quite visible IMO.
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gmatbull
When children become teenagers, scientists believe that their sense of taste begins to evolve more because
their sense of smell is heightened than because their taste buds change
.

A: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightened
than because their taste buds change
B: their sense of taste evolves, scientists believe, more because their sense of smell becomes heightened than
because of their taste buds changing.
C: their sense of taste evolves, scientists believe, due more to their sense of smell heightening than their taste buds
changing.
D: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightening than
because their taste buds are changing.
E: their sense of taste begins to evolve, scientists believe, more because their sense of smell becomes heightened
than because their taste buds change.

OA
to follow

E resolves the modifier issue....

IMO E
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gmatbull
When children become teenagers, scientists believe that their sense of taste begins to evolve more because
their sense of smell is heightened than because their taste buds change
.

A: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightened
than because their taste buds change
B: their sense of taste evolves, scientists believe, more because their sense of smell becomes heightened than
because of their taste buds changing.
C: their sense of taste evolves, scientists believe, due more to their sense of smell heightening than their taste buds
changing.
D: scientists believe that their sense of taste begins to evolve more because their sense of smell is heightening than
because their taste buds are changing.
E: their sense of taste begins to evolve, scientists believe, more because their sense of smell becomes heightened
than because their taste buds change.

OA
to follow

The answer is E
"When children become teenagers " should be followed by some action related to the teenagers.
B has parallelism error the participle changing modifies buds hence wrong it is an action so we need proper verb
C has incorrect comparison
D Again we need something related to teenagers not scientist .
E correct
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