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Option 2 : II is the cause and I is the effect.
Answer: Option 2. II is the cause and I is the effect.
Buildings in cold areas have to be warm so that the people inside it can be comfortable. And, glass traps heat very easily. So the buildings are made up of glass so that glass can trap heat of the sunlight and keep the building warm and prevents the warmth from going outside. So I is the effect and II is the cause.
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