## A

public class Box {
    Box() {}
    Box() {}
}

## B

public class Box {
    Box(int size) {}
    Box(double size) {}
}

## D

public class Box {
    private Box() {}
    public Box(int size) {}
}

## C

public class Box {
    Box(int size) {}
    Box(int length) {}
}

B and D