A science teacher put this statement on the board. All matter is made of
which may combine to form
Which pair of words, in their given order, would correctly complete this statement?
A
elements, atoms
B.
atoms, molecules
с
compounds; atoms
D
molecules, elements

Pretty darn confusing but you’ll get B as an answer.

It is atom as atoms are generally the most basic structures of an element. Why molecule, not compound?

Molecule is another simple structure and a compound may not always consist of a single type of molecule. Therefore, the answer is atom and molecule.