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In a displacement reaction between a metal X and the salt solution of metal Y, what must be true about X's reactivity compared to Y's?

Question
In a displacement reaction between a metal X and the salt solution of metal Y, what must be true about X's reactivity compared to Y's?
X must be less reactive than Y
X must be more reactive than Y
X and Y must be equally reactive
Reactivity is irrelevant to displacement
Answer
X must be more reactive than Y
Detailed Explanation
For a displacement reaction to occur, the free metal (X) must be more reactive than the metal (Y) in the compound it is displacing.
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