Choose the right option. His brother has got ___ pens.

The word "pens" is a countable noun. Therefore, we need a determiner that can be used with countable nouns. "Much" is used with uncountable nouns. "Few" and "a few" are used with countable nouns to indicate a small number. "Little" and "a little" are used with uncountable nouns. Since the sentence implies a specific, albeit small, number of pens, "a few" would be the most appropriate choice if it were an option. However, among the given options, "few" is the correct choice for countable nouns indicating a small quantity. The selected option is "few".