The correct answer is: C. Either I or II is implicit
The statement “Films have become indispensable for the entertainment of people” does not state that films are the only media of entertainment, nor does it state that people enjoy films. However, it is possible that both of these assumptions are true. For example, if films are the only form of entertainment that is available to people in a particular situation, then they may become indispensable for their entertainment. Additionally, if people enjoy films, then they may choose to watch films even if other forms of entertainment are available.
Therefore, either assumption I or assumption II is implicit in the statement.