The correct answer is C. Film
Step-by-step explanation:
In art, a medium refers to the means or instruments used to present an artistic piece. In the case of acting which refers to the act of interpreting and performing a character, common media (plural of medium ) include radio, television, films, and theatre as these are the main medium or instruments used by actors and actresses. According to this, the only one from the options that would be considered an actor's medium is the film. Additionally, others such as comedy, drama or direction are part of acting but are not instruments for it or media.