Summarize the venn diagram.
a) compounds are found inside the matter of atoms.
b) a pure substance may contain subatomic particles but not atoms.
c) compounds are the most basic form of matter. they combine to form larger atoms.
d) atoms are the most basic form of matter. they combine to form larger electrically stable compounds.

If this is a multiple choice question, then the answer is D.

Explanation:

Compounds are composed of atoms, which are composed of subatomic particles and consist of matter. Since they are composed of atoms rather than vice-versa, compounds cannot be found inside atoms and are not the most basic form of matter (ruling out A and C). A pure substance contains atoms, which are each composed of subatomic particles. Therefore, a pure substance must have atoms if it contains subatomic particles (ruling out B). The only answer left is D.