What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class Box{
    int capacity;
public:
    Box(){}
    Box(double capacity){
	this->capacity = capacity;
    }
    bool operator<(Box b){
	return b.capacity < this->capacity? true : false;
    }
};
int main(int argc, char const *argv[])
{
    Box b1(10);
    Box b2 = Box(14);
     if(b1 < b2){
	cout<<"B1's capacity is small";
    }
    else{
	cout<<"B2's capacity is small";
    }
    return 0;
}

A. B1's capacity is small

B. B2's capacity is small

C. Error

D. Segmentation fault

Answer: Option B