When you heat up the air inside a hot air ballon, it rises. Why does that occur?

A. The volume of the balloon decreases

B. The mass of cold air displaced by the balloon is less than the mass of hot air inside the balloon

C. The hot air inside the balloon is less dense than the air outside the balloon

D. The hot air inside the balloon becomes denser than the air outside the balloon

Please answer quickly

I believe the answer is C. The hot air inside the balloon is less dense than the air outside the balloon

Explanation: Hot air balloons fly when the air inside the hot air balloon is less dense than the air surrounding it. Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air.

i am going to put the answers in order i dint feel like typing it out so yeah

a

d

c

b

b

b

a

d

a

b

c

c

c

b

d