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Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R). Select your answer from the codes given below:

Assertion (A):The boundary between two air masses of different density is known as a front.
Reason (R):The difference in density is caused by differences in temperature and humidity.
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true, but R is not the correct explanation of A
CA is false, but R is true
DA is true, but R is false
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