Why does switching between languages seem to help the brain?

Studies suggest that people who learn a second language may keep their minds sharper in old age. Learners must switch between two sets of vocabulary and grammar, which appears to train attention and memory. Children often pick up pronunciation more easily than adults, but adults can learn grammar rules faster because they understand explanations. Teachers therefore recommend different methods for different ages and encourage learners of every age to practice speaking regularly.

Answer and explanation

Correct answer: A. It trains attention and memory

  1. Step 1: The passage says switching vocabulary and grammar appears to train attention and memory.
  2. Step 2: That is the proposed benefit.
Answer
It trains attention and memory.
Why not the others: Sleep, less study and hearing are not mentioned.

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