Robinson Crusoe lives on a desert island by himself. Trade allows him to: I. Raise his real income. II. Consume outside his PPF. III. Produce outside his PPF. Group of answer choices Only I and II are...

Robinson Crusoe lives on a desert island by himself. Trade allows him to:

I. Raise his real income.

II. Consume outside his PPF.

III. Produce outside his PPF.

Group of answer choices

Only I and II are true.

I, II, and III are all true.

Only I is true.

Only II is true.