Detect and fix issues in a C++ program with multiple inheritance

In this fragment of C++ code, there are incorrect type casts and errors related to multiple inheritance. They need to be fixed so that the code compiles without errors and correctly uses polymorphism.

# include <iostream>
struct A
{
    virtual ~A() = default;
};
struct B
{
    virtual void foo() {};
};

struct C: public B, public A
{
    C() : B(), A()
    {
    std::cout<< "C";
    }
    void foo() override
    {}
    int c;
};

void Foo(A* a)
{
    auto cl = static_cast<C*>(a); // 1
    auto b1 = static_cast<B*>(a); // 2

    auto b1_ref = static_cast<B&>(*a); // 3
    auto cl_ref = static_cast<C&>(*a); // 4

    auto c2 = dynamic_cast<C*>(a); // 5
    auto b2 = dynamic_cast<B*>(a); // 6

    auto c2_ref = dynamic_cast<C&>(*a); // 7
    auto c3 = reinterpret_cast<C*>(a); // 8
}

Your task is to analyze the casts, determine which are invalid or potentially dangerous, and make the necessary corrections using appropriate cast types and correct base class initialization.