The environmental lapse rate is best described as

A. a decrease in air temperature by 0. 65 ⁰C per 1000m of ascent in the atmosphere
B. the rate of temperature changes within the stratosphere
C. a fall in air temperature by 6.5^{0100m of ascent in the stratoshere>}
D. a decrease of air temperature by 6.5^{0per 1000m of ascent in the troposphere>}
E. a fall in air temperature by 0.6^{0per 100m of ascent in the atmosphere>}  

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Correct Answer: E