Select the option that will improve the highlighted part of the sentence. In case no improvement is needed, select ‘No improvement required’.
Both of mine child passed the examination successfully.

Correct option is A

The correct substitution of the highlighted words is (a) my children passed.
Explanation:
The phrase "Both of mine child" is grammatically incorrect.
Firstly, mine is a possessive pronoun, not a possessive adjective.
When modifying a noun directly (like child), we should use a possessive adjective— my, not mine.
Secondly, the word child is singular, but both refers to two, so the noun must be plural: children.
Also, the verb passed is correctly used in the past tense, as the action is completed.
Grammatical rule used:
· Mine is used without a noun: "This pen is mine."
· Use my before a noun: "This is my pen."
· Both always refers to two entities, hence the following noun must be plural.
Example:
✅ Both of my children scored well in the exam.
❌ Both of mine child passed the exam.