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Because the scope of auto variables is only in the block in which they are declared. As soon as the program exits from the block, the auto variables no longer exist.

Auto variables are not stored in heap because heap is for dynamic memory allocation, it is like an unorganised bunch of memory from which u can allocate any size of mememory. An auto variable is allocated memory before only so it is allocated systematically on the stack.

where do you find a heap when you were running early during boot ?
you initialize the stack before you run C program, but you didnt intialize heap before you run C
therefore local var will have no choice but to be stored in stack