The other options of the question were C) strings and D) percussions.
The two sections of the orchestra that displayed the lowest timbre in Britten's piece are brass and percussions. We are talking about BenjaminBritten piece of work called "The Young Person's Guide to the Orchestra," inspired in the piece written by Henry Purcell "The Dance in Rondeau Form" from "Abdelazar." Benjamin Britten wrote his composition in 1946 and is based on the overall form of variation and theme.