Select the most appropriate meaning of the given idiom.
"On the ball"

Correct option is B

Explanation of the Correct Answer: · "On the ball" means being alert, aware, and quick to understand or react to a situation.
· Example sentence: "She is always on the ball during meetings and never misses important details."
Why Are the Other Options Incorrect? · (a) "To be inattentive" → Incorrect; the idiom means the opposite.
· (c) "To be unaware of any changes happening around" → Incorrect; the phrase signifies alertness.
· (d) "To not understand a situation well" → Incorrect; "on the ball" refers to quick comprehension.
Thus, the correct answer is: (b) To be aware of any changes or developments and quick to react to them.