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How long is the Mackenzie River?

  1. 2,500 kilometres

  2. 3,200 kilometres

  3. 4,200 kilometres

  4. 5,000 kilometres

The correct answer is: 4,200 kilometres

The correct answer is C) 4,200 kilometers. The Mackenzie River is the longest river system in Canada, extending approximately 4,200 kilometers from its source in the Great Slave Lake to its mouth in the Arctic Ocean. Option A is too short, as the Mackenzie River surpasses that length. Option B is too short, as the Mackenzie River extends beyond that length. Option D is too long, as the Mackenzie River does not reach that length.