Was one of the most lucrative parts of the music business at the end of the nineteenth century. a. providing music lessons b. giving concerts c. writing sheet music d. selling instruments

Hi there!

The answer is A. Providing music lessons. 

Many famous composers took to giving music lessons to make money. Providing music lessons was one of the most lucrative parts of the music business at the end of the nineteenth century. 

Hope this helps!

Where is the painting?

Iwould say d) signed unknown street singers who brought original songs to record.