Which of these is true about pure substances?

a. they can only contain one type of atom

b. they can only contain one type of molecule

c. they may contain one type of atom or one type of molecule

d. they can contain different types of atoms and molecules

They can only contain one type of atoms, one type of molecules or one type of ionic salts

Explanation:

Remember that substances might be made of:

That said, pure substances would only contain one type of atoms, one type of molecules or one type of ionic salts. Any additional components of different atoms, molecules or ionic salts would cause a pure substance to become a mixture of several substances.

i would say b

explanation:

but i think i would need more information than that

what does the table look like