Among the options, C is the most practical and healthiest shown. Leaning forward (like Rodin’s Thinker) helps relax the puborectalis muscle and open the anorectal angle for easier, less-strained elimination.
B is closest to the natural full squat that works best physiologically, but it is unsafe on a standard raised toilet (slip, crack, or fall risk).
A keeps the kink; D makes it worse.
Ideal everyday method: sit normally, raise knees above hips on a low stool or books, lean slightly forward with elbows on thighs. Less strain, more complete emptying.
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