Correct Answer: ablity

Solution : The third option is the correct answer.

The correct spelling is ability . Ability refers to the capacity to do something or the quality of being able to perform a particular action or task. It is the correct spelling for the word denoting capability or skill.

The meanings of other options are as follows:

• A pupil is a person who is taught by another, especially a schoolchild or student, about a teacher.
• Capacity means the maximum amount that something can contain.
• A teacher is a person who teaches, especially in a school.