The correct option is
B Indefinite numeral adjective
Adjectives of number are the adjectives that are used to depict either the number of nouns or their position or place in a certain order. Option A: Definite numerical adjective: These adjectives specify a definite number like one, sixth, fifth, double, two, fifty five etc.
Option B: They give indefinite amount like some, few, many, all, no, several, etc but are used for countable nouns. In this sentence a general idea has been given about the number and it is not specified. This is the correct answer.
Option C: Examples of distributive adjectives are each, every, neither, either, etc.
Option D: Demonstrative adjective are adjectives that are used to modify a noun so that we know which specific person, place, or thing is mentioned.
Option B is the correct option.