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

I believe the correct answer is B. writing sheet music.
A is definitely not correct because it was a different time, and concerts were not as popular as today's are, and even if they were, they wouldn't bring that much money to the artists. C is also incorrect because how rich can you get if you sell a couple of instruments? Although D was a popular 'job' at the time, it didn't bring nearly as much money as writing sheet music to be performed elsewhere. 

It represents ask goo

Answer: (d) all the aboveexplanation:

the above mentioned statements talks about the creativity of an artist and to what extend they can utilize and experiment on the objects provided.   differing size and subjects are given so that an image of wisdom is created. displaying a transition from light to dark in something by darkening sections in order to create a shadow. and lastly, putting bits and pieces together to formulate a new image.