C++ quiz. Is the code correct from the viewpoint of memory a

Is the code correct from the viewpoint of memory allocation?

#include <iostream>
using namespace std;
class A {
private:
    int x;
public:
    A():x(10){}
};
A &foo()
{
    return *(new A); //1
}
int main()
{
    A &a=foo();//2
    delete &a; //3
    return 0;
}

Error in line 1
Error in line 2
Error in line 3
Code is correct
Code is not correct

Explanation

The code is correct: the delete operator releases the memory allocated in the foo() function. In line 1 the pointer is dereferenced to return the reference to the object, in line 2 the object is returned, in line 3 the address of the released area is passed to the operator delete.