Juan lays an object on a table in a well-lighted room. The object absorbs all visible light waves. What color object does Juan see? A. white
B. black
C. violet
D. red

I need the answer for science asap

Describe the process that was used in this lab to create magnesium oxide, specifically identifying the type of chemical reaction. explain why the product had a higher mass than the reactant, and how this relates to conservation of matter.