The correct answer is D) woodwinds.
The section of the orchestra that is considered the foundation for its unique timbre is woodwinds.
An orchestra has four main groups of instruments. These are string instruments such as the viola or the violins; woodwinds as the flute and the oboe; percussion instruments such as the triangle or the bass drum; and brass instruments such as the tuba and the trumpet. An orchestra has to be led by a director or conductor that uses his arms and hands to conduct the orchestra.
