Question

Given below are assertion and reason  Assertion: The Earth's atmosphere is divided into distinct layers – Troposphere, Stratosphere, Mesosphere and Thermosphere.  Reason: The division of the atmosphere into layers is based on variations in temperature and composition at different altitudes. Based on the statement choose the correct option

A Both the assertion and reason are correct, and the reason is a correct explanation of the assertion.
B Both the assertion and reason are correct, but the reason is not a correct explanation of the assertion.
C The assertion is correct, but the reason is incorrect.
D Both the assertion and reason are incorrect.
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