Question : Select the option that will improve the underlined part of the given sentence. In case no improvement is needed, select 'No improvement required'.
Grammar is just a natural function of children's brains, and they apply it to whatever they find.
Option 1: No improvement required
Option 2: they applied them to
Option 3: they apply them for
Option 4: they apply that in
Correct Answer: No improvement required
Solution : The first option is the correct answer.
The sentence is grammatically correct and effectively conveys the idea that grammar is a natural function of children's brains, and they apply it to whatever they find. The structure and they apply it to is clear and appropriate in this context.
Therefore, no improvement is required.