Answer:
i would say D i just did this but i kinda forgot so sorry if im wrong or A
Explanation:
Gas takes the shape and volume of its container because the particles in a gas are loosely packed, so that it doesn't have a defined shape or volume. This is why it takes the shape/ volume of it's container.
Magnesium is a 2+ metal, located in the alkaline earth metals group of the periodic table (group 2).
I believe it is C, high organic matter level.