Final answer:
The primary purpose of the sentence is to A. persuade the reader.
Step-by-step explanation:
A sentence is a grammatical unit comprising a subject and a predicate. It conveys a complete thought and functions as a standalone statement, question, command, or exclamation. Proper sentence construction adheres to language rules, providing clarity and coherence in communication.
The primary purpose of the given sentence is to persuade. The sentence presents an argument that fast-food chains should not be allowed to advertise their high-fat, high-calorie products to children. The purpose is to convince the reader that this restriction should be implemented. The sentence aims to influence the reader's opinion by providing reasons and supporting evidence.