关于以下C++代码，（ ）行代码会引起编译错误。
#include <iostream>
using namespace std;
class Base {
private:
int a;
protected:
int b;
public:
int c;
Base() : a(1), b(2), c(3) {}
};
class Derived : public Base {
public:
void show() {
cout << a << endl; // Line 1
cout << b << endl; // Line 2
cout << c << endl; // Line 3
}
};
- A.
Line 1 - B.
Line 2 - C.
Line 3 - D. 没有编译错误