Which is not a property of a mineral A: magnetism
B: color
C: reflection
D:cleavage

Hello There!!

I think the answer is:

Ask a question....

Because, Usually it's good to ask question before doing the next steps.

Here's a Explanation.

What if the person is new here and It didn't know where to go or how to do the project or the person were asking for.

And, If the person did it without don't know what to do it's good to ask question instead before doing it!

ヾ(•ω•`)o