Aluminum is an element. which best describes what makes up a sample of aluminum? one kind of atom two different kinds of atoms all carbon-based atoms a carbon atom and non-carbon atoms

One kind of atom.

Step-by-step explanation:

An element consists of one kind of atom.

Al is an element, so Al consists of one kind of atom.

C  and D are wrong , because Al contains only atoms of aluminium.

one kind of atom

Explanation:

Element is a pure substance which is composed of similar atoms.It can not be decomposed into simpler constituents using chemical reactions.Example: Aluminium

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water

Thus as aluminium is made up of one kind of atom , it is considered as an element.