Compile error: compareTo must return int

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AP Computer Science A· difficulty 2/5

public class Score implements Comparable<Score> {
    private int v;
    public Score(int x) { v = x; }
    public boolean compareTo(Score o) { return v < o.v; }
}

What occurs?

A
$Compiles with warning$
B
$Runtime error$
C
$Compiles fine$
D
$Compile error: compareTo must return int$
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Explanation

Comparable <T> requires int compareTo(T). Returning boolean does not satisfy the interface, so the class fails to compile.

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