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1 > x , p = BSS (Block Started By Symbol ) , x has global scope and p has function scope but lifetime of both the variables is whole program run .

2> y = Global scope . stored in BSS .

3> q = Function scope . Stored on stack . lifetime = as long as function executes.

By default static stores ZERO na,

how it goes to bss section. Could you mind elaborate...

static initializes to zero by default na.

if static and global variable are not intialized at point of decleration they goes to BSS secetion . if initialized they goes to DATA section

scope of x,y,p,q and where respective variables are stored.

static int x;
int y;

void foo()
{
static int p;
int q;
}

x and y are both global variables, but the difference: due to the static key word on x, x is not accessible from another file unlike y. means there is scope difference.