What will be the correct statement in the following C# code?

class trial
{
    int i;
    float d;
}
struct sample
{
    private int x;
    private Single y;
    private trial z;
}
sample s = new sample();

A. trial object referred by z is created on the stack

B. z is created on the heap

C. Both s and z will be created on the heap

D. s will be created on the stack

Answer: Option D