The Thermosphere Expands in Size During Periods When the Sun

The thermosphere expands in size during periods when the Sun is ________ because ________.

A) quiet the pressure of the solar wind diminishes
B) quiet the exosphere sinks downward and squeezes the thermosphere
C) active the exosphere moves outward,thereby relieving pressure on the thermosphere
D) active the thermosphere acquires greater kinetic energy,which causes the gas molecules that comprise the thermosphere to move further apart from one another.
E) active the thermosphere absorbs matter from the sun causing the volume of the air to increase.