The noun "hair" is uncountable, so it does not take a plural form like "hairs."
The correct structure for adjectives is: adjective + adjective + noun.
The correct phrase is:
"long and black hair".
The correct sentence should be:
"She has long and black hair."
Thus, the correct answer is Option A ("long and black hair").
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?