The correct plural of "mouse" is "mice", not "mices".
Additionally, for plural subjects like "mice", the correct verb form is "live" or "have lived", not "has been living".
The correct sentence is:
"Mice have lived in holes."
Thus, the correct answer is Option D ("Mice have lived in holes").
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?