The correct option is D Pieces - Countable Noun
Countable nouns refer to individual people, places or things and can be counted. They have both singular and plural forms, example, apple/apples. Uncountable nouns do not refer to individual objects and hence cannot be counted, like rice, flour. Uncountable nouns do not have a plural form. In the sentence, 'pieces' is countable as you can count the number of the broken pieces, hence option D is correct. Option A is incorrect because 'we' is not a noun, to begin with and 'pieces' is not an uncountable noun, it can be counted as two pieces, three pieces and so on. Option B is incorrect because pieces isn't an uncountable noun, as it can be counted. Option C is incorrect because even though 'pieces' is countable, 'we' is not a noun, it's a pronoun.