Final answer:
Variety is a trade magazine, distinct from general-interest magazines and tailored for industry professionals with news and analysis pertaining to the entertainment industry.
Step-by-step explanation:
The question's subject is an example of a trade magazine. Variety is the correct answer here, as it is a weekly entertainment trade magazine that covers the business of the entertainment industry, including film, television, and music. Therefore, the correct answer to the question would be D. Variety. Unlike general-interest magazines such as The Nation (progressive/liberal politics) or National Review (conservative politics), trade magazines like Variety are designed specifically for professionals in a particular industry, providing industry news, trends, and analysis.