Why does the size of a derived class include private members from the base class?

Question

I have the following code:

class A {
  private:
    int i;
 };

class B : public A {
 private:
  int j;
 };

When I check sizeof(B)

Answer 1

i dont know what language this is, but when you inherit the original object still exists. that is why you can still call base.method()