I believe the answer is D. Here is a really good link to help you figure out the concept.
http://www.takadimi.net/documents/Takadimi%20short%20guide%20for%20Web.pdf
Hope this helps!
<span>The PLATO answer is C, in the order B,A,C.</span>
Seriously you want us to write you an entire essay?! What are you on because if your acting like this I need some of it.
They are both string instruments.
