-- The sample was a fluid.
-- It was a mixture or a suspension ... NOT a solution.
I believe your answer should be C. Speed.
<span>A physical change is any change that alters the form or appearance of a substance but does not change it into another substance
-Some of the physical properties may be altered, but the chemical composition stays the same
-Examples: Bending, Crushing, Cutting, Melting, Freezing, Boiling</span>