The correct word to use is "few".
The word "few" is used to refer to a small number of countable items, in this case, "friends".
The sentence becomes:
She has few friends.
The correct answer is "few".
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?