Clouds act in much the same way as high humidity in earth's atmosphere. the presence of clouds means moist, humid, atmospheric conditions. this promotes heat retention, and nighttime temperatures, than on a clear, dry night.
a) less; lower
b) more; lower
c) less; higher
d) more; higher

The answer to the question stated above is letter D. more;higher.

Clouds act in much the same way as high humidity in Earth's atmosphere. The presence of clouds means moist, humid, atmospheric conditions. This promotes greater (more) heat retention, and higher nighttime temperatures, than on a clear, dry night.