Answer:
All elements are composed of Atoms.
(if you have the same question with a different set of answers read the notes I left down bellow)
Step-by-step explanation:
Dalton’s Atomic Theory - All elements are composed of atoms, atoms of the same element are identical, atoms of different elements can chemically combine to in whole number ratios, chemical reactions occur when atoms are separated, joined or combined.
(those are from my notes that I took for my chem module. I really hope this helps, also I took the test and this is the right answer :)) )