Which of the following is the most dense? Cold, salty water
Cold, fresh water
Warm, salty water
Warm, fresh water

Cold, salty water

Explanation:

cold water is more dense than warm water because hot water molecules move faster than molecules of cold water. High salt content is more dense than water with no salt: in fact, salt is more dense then water, So, Cold water and salty water both have high density.

real, smaller and upside-down.   so the answer should be b.