Which research question is most appropriate for a research project requiring analysis--not just reporting--of information?
how many horror films include nature as the “villain” in the story?
how have film production techniques changed since the era of silent movies?
what was the first horror film ever produced for a broad cinema audience?
what role has the horror film played in expressing americans’ fear of “outsiders”?

among the options given on the question the correct answer is option B.

B. How have film production techniques changed since the era of silent movies?

Explanation: The sentences provided on the question's option ask for different answers. But there is a common type between three question and one if different.

The first question wants to know the number of horror films which include nature as villain. So this question is information based question which doesn't  require analysis.

The 3rd question wants know the name of a film which was produced for a broad cinema audience. So this question seeks for a information which doesn't ask for any further analysis.

The 4th question asks for a report about the role of horror movies in expressing the American's fear of outsiders. This question is also not analytic.

But the 2nd sentence asks to describe the changing the silent era of film by production technique. This question requires the analysis about the silent era of film and also the production technique explanation.

Therefore,2nd question is most appropriate for the analytic research project.