The answer would be b, two violins, a viola, and a cello. the definition of a string quartet is a group of 4 musicians playing string instruments. all of the other answers would be wrong because they contain other instruments besides string instruments, like piano, horn, woodwind, and clarinet. i hope this helps! :D
Answer:
I can't see the picture of the artwork so I can't really answer. Sorry :/
Its said to have an harmonious balance.
Try to trace a round object
