Our behavior very much depends on the state of not only the brain and also the immune system.

Our behavior very much depends on the state of not only the brain and also the immune system.

A – very much depends on the state of not only the brain and also the immune system.

B – very much depends not only on the state of the brain but also the immune system.

C – is very much dependent both on the state of the brain but also on the state of the immune system

D – is very much dependent not only on the state of the brain but also on the state of the immune system

E – depends, very much, not just on the state of the brain but on the state of the immune system

Right Answer: D

Error Identification

Identifier	Error Type
Not only… but also	Idioms

Explanation: 

The sentence contains the fixed expression not only … but also. Several options, including the original sentence, use the standard expression incorrectly. 

A – ‘very much depends on’ is awkward; ‘not only … and also’ is unidiomatic. 

B – depends not only ‘on the state’… but also ‘the immune…’ is a wrong comparison. 

C – ‘both X but also Y’ is unidiomatic. 

D – This uses the correct standard construction and is idiomatically correct. E – ‘not just on…. But on…’ is unidiomatic.