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单项选择题

Which line contains a constructor in this class definition?()  
public class Counter { // (1)  
int current, step;  
public Counter(int startValue, int stepValue) { // (2)  
set(startValue);  
setStepValue(stepValue);  }  
public int get() { return current; } // (3)  
public void set(int value) { current = value; } // (4)  
public void setStepValue(int stepValue) { step = stepValue; } // (5)  }  

    A.Code marked with (1) is a constructor
    B.Code marked with (2) is a constructor
    C.Code marked with (3) is a constructor
    D.Code marked with (4) is a constructor
    E.Code marked with (5) is a Constructor

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