Parts of the following sentence are given as options. Identify the segment that contains a grammatical error. 

Each one of the children in a nursery class require individual attention.

Select the most appropriate meaning of the given idiom.

Keep a lid on

Select the most appropriate ANTONYM of the given word.

DETERMINED

Select the most appropriate antonym of the given word.

RELEVANT

 Select the most appropriate antonym of the given word.

TURBULENT

Impasse

(i) Negotiations have reached an impasse .

(ii) Our impasse response to the attack was sheer horror.

Abstain

There was a persistency (A) to his nature, a sort of dogged (B) determination that she would have admired (C) if it didn't great (D) her so.

Select the most appropriate synonym of the given word.

DETAIN

Select the most appropriate synonym of the given word.

ENTANGLE

Select the most appropriate word to fill in the blank.

She ___on paying the bill at the restaurant.