Assertion (A) : The top of the mesosphere, called the mesopause,

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Assertion (A) : The top of the mesosphere, called the mesopause, is the coldest place on Earth.
Reason (R) : Temperatures in the upper mesosphere fall as low as - 100 ^°C varying according to latitude and season.

1. If (A) and (R) are true and (R) is the correct explanation of (A)
2. If (A) and (R) are true but (R) is not the correct explanation of (A)
3. If (A) is true but (R) is false
4. If (A) is false but (R) is true

Correct Option: A

NA