Answer and explanation

Correct answer: B. The manager is responsible for the safety of the staff.

  1. Step 1: The adjective 'responsible' takes 'for' before the thing someone is in charge of. Step 2. 'Responsible for' is the standard collocation. Answer: The manager is responsible for the safety of the staff. Why not the others: 'of', 'to' and 'at' do not fit this collocation.

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