A scientist question should be A. vague
B. non-repeating
C. creative
D. non-testable

Creative

Explanation:

A scientific question is a scientific inquiry which is framed on the basis of observation and limited evidences obtained from the natural processes. A particular scientific question should be testable, repeated so as to determine the accurate and reliable answer obtained after experimental procedures.

It should be creative means it should be original, unique and must frame the curiosity of the scientist.

a, i am pretty sure.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy