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prealgebra senior

Problem

Tom has a collection of snakes, of which are purple and of which are happy. He observes that all of his happy snakes can add, none of his purple snakes can subtract, and * all of his snakes that can't subtract also can't add. Which of these conclusions can be drawn about Tom's snakes?
(A) Purple snakes can add.
(B) Purple snakes are happy.
(C) Snakes that can add are purple.
(D) Happy snakes are not purple.
Solution
Combining and gives Clearly, the answer is
Final answer
D