The final sentence ('If a task cannot be explained in a single sentence...') implies that the author believes:

Every evening, millions of students sit at kitchen tables finishing tasks they started at school. Supporters of homework say it builds discipline. Yet research that follows students across several years shows only a weak link between nightly homework and results in the early years of high school. Meanwhile, the costs are clear: less sleep, less time for sport, and family dinners eaten in a rush. A ban may be too extreme. But schools could set a simple rule: homework should be short, purposeful and never given to fill time. If a task cannot be explained in a single sentence, it probably does not belong in a school bag.

Answer and explanation

Correct answer: A. good homework needs a clear, simple purpose

Answer: a clear and simple purpose. Why not the others: The sentence is about the clarity of the purpose, not the amount, the writer or the parent.
  1. Step 1: The sentence links a simple explanation to belonging in a school bag.
  2. Step 2: So a task needs a clear, simple purpose.

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