If Zara books the tickets online, then Zara gets a discount. If Zara gets a discount, then Zara buys a souvenir. It is known that Zara books the tickets online. Which of the following must be true?
Correct answer D. Zara buys a souvenir.
Explanation
Since Zara books the tickets online, the first rule shows that Zara gets a discount. The second rule then shows that Zara buys a souvenir. This is modus ponens applied twice along the chain.
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