ANS:D - 14°

In most homes, there is a P-trap installed under the sinks in the bathroom and kitchens. A P-trap is a plumbing fixture that has several purposes. It traps debris that has drained from the sink and prevents it from forming a clog deep within the plumbing system and to stops sewer gases from passing in to the home. The slope of the outlet of "P trap" below the horizontal is kept at 14°.