Consider the following class interfaces: class Teacher
{
public:
Teacher();
Teacher(string new_name);
string get_name() const;
private:
string name;
};
class MathsTeacher : public Teacher
{
public:
MathsTeacher();
MathsTeacher(string new_qualification, string new_name);
void display_data() const;
private:
string qualification;
};
int main()
{
Teacher t1, t2("John");
MathsTeacher mt1, mt2("TopLevel", "Sarah");
t1 = mt1;
t1 = t2;
mt1 = mc2;
mt1 = t1;
return 0;
}

Which one of the preceding assignment statements in the function main() would slice away the data of the derived class object?
A. c1 = ac1
B. c1 = c2
C. ac1 = ac2
D. ac1 = c1