The most narrow topic among the other topics is cost of school lunch. Thus option (C) is correct.
What is the meaning of Narrow topic?
The Narrow Topic refers to the subject which is very confined and includes the concepts and focuses on the specific area of research or the work.
The cost of the lunch box is the too narrow topic among the other topics given in the above options. Therefore, the correct option is cost of school lunch i.e. is the option (C).
Learn more about Narrow Topic here:
https://brainly.com/question/476018
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