Answer and explanation

Correct answer: C. at the top, tied to a firm point

  1. Step 1: Tying at the top stops the ladder slipping sideways or outwards. Step 2. Footing or a weight are used only if tying is not possible. Answer: at the top, tied to a firm point. Why not the others: A sandbag, a person on a rung or an unfixed ladder are weaker than tying.

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