Ineed on this asap. i also need an explanation to go with the answer.

Im guessing the answer is D. Stacie

Explanation:

"Ice floats because it is about 9% less dense than liquid water. In other words, ice takes up about 9% more space than water, so a liter of ice weighs less than liter water. The heavier water displaces the lighter ice, so ice floats to the top."

-Thoughtco

Therefore the only logical option left is Stacie's answer.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves