Statements : Some packets are keys.
Some bags are keys.
conclusions: Some bags are keys.
II Some packets are bags
III Some bags are not keys.
IV Some packets are not bags.

Options

A. I and II follow
B. Either I or III and II follow
C. I and either II or IV follow
D. Either I or III and either II or IV follows

Answer

B

Explanation

I and III form a complementary pair. II follows after convering the first statement.