With the addition of more and more instruments to the orchestra composers could pay more attention to: A. tonality. B. dynamics: C. form. D. tone color.

The correct answer is D. tone color.<br /><br />With the addition of more and more instruments to the orchestra, composers could pay more attention to tone color. Tone color refers to the unique quality or timbre of a sound that distinguishes it from other sounds. By incorporating a wider variety of instruments, composers can create a richer and more diverse palette of tone colors, allowing them to explore new textures and soundscapes in their compositions.