Children . . . . . . . . the age of five can’t be admitted to this school. A. under B. at C. in D. with

The correct answer is A. under.

The word “under” is used to indicate that something is less than a certain amount or number. In this case, it is being used to indicate that children who are less than five years old cannot be admitted to the school.

The other options are not correct because they do not accurately convey the meaning of the sentence. The word “at” is used to indicate a specific time or place. The word “in” is used to indicate a location or period of time. The word “with” is used to indicate that something is associated with or connected to something else.

Here are some examples of how the word “under” can be used in other sentences:

• The child is under five years old.
• The price of the car is under \$10,000.
• The building is under construction.
• The team is under pressure to win.