The temperature change is proportional to the solar radiation.
This hypothesis has the distinct advantage over the first one of matching our understanding of how the temperature of an object changes. According to what is known as the First Law of Thermodynamics, the change in temperature of a parcel at a particular pressure is proportional to the amount of heat energy added (or subtracted) from the parcel.
What predictions can be drawn from this hypothesis? Check all that apply. Note that I am not asking you which of the statements are true; I am asking you which of the statements WOULD be true if the hypothesis were correct.
Since the temperature does, in fact, fall at night, this hypothesis can't be correct. Go back to the list of hypotheses and select another one.