The given sentence requires an article before the musical instrument, violin. Both definite and indefinite articles can be used with musical instruments.
'A' or 'an' is used to express musical instruments as one of the physical object. For example - I don't have a violin.
However, to express 'violin' as a category of instruments, a definite article must be used.
No article is used when we refer to general ideas, plurals or uncountable nouns.
Thus, the correct answer is Option C.