If the statement "All saints are materialists" is given as true, which of the following statements can be inferred to be true?

If "All saints are materialists" is true, then "Some saints are materialists" is also true.

The given statement is a universal affirmative proposition.

Under subalternation the truth of the universal carries down to the particular.

The subaltern of the universal affirmative is the particular affirmative with the same terms.

Whatever holds of all members must hold of at least some of them.

Hence the particular affirmative follows validly by subalternation.