Answer and explanation

Correct answer: C. Always, for clear visibility

  1. Step 1: Good visibility is required in all conditions, so glass and mirrors must be clean.
  2. Step 2: Dirty glass increases dazzle.
Answer
Always, for clear visibility.
Why not the others: Only during winter driving conditions, only while driving at night on country roads and only when driving on motorways at speed don't fit.

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