Concept:The suffix '-ist' is used to form nouns that refer to a person who performs a specific activity or profession.Explanation:'Violin' is a musical instrument.Adding '-ist' gives 'violinist', which means a person who plays the violin.The other suffixes do not form meaningful words: '-am' is not a valid suffix; '-en' usually changes a noun into a verb (e.g., strengthen); '-ty' creates abstract nouns (e.g., beauty, royalty).Only '-ist' correctly creates a noun for a person associated with the violin.Answer:Option C (-ist)