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B
Mesosphere
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C
Stratosphere
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D
Troposphere
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Solution
The correct option is A Thermosphere
The ionosphere is defined as the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies 75-1000 km (46-621 miles) above the Earth, a region that includes the thermosphere and parts of the mesosphere and exosphere as shown in the above diagram.