Which is correct?
B) He gave her a piece of white paper.
He ate a large piece of cake. (Means the piece was big.)
He ate a piece of a large cake. (The cake was big.)
However, when both forms are widely accepted as having the same meaning and you have nothing better to do/ need a cure for insomnia, then:
- Quantity (or number)
- Quality (or opinion)
- Proper adjective
- Purpose (or qualifier)
Color comes after size, the size being "a piece", so B is correct.