The answer is D. All you have to do is add all of the angles for each choice you're given. It has to add up to exactly 180, because every triangle is 180 degrees.
The answer is since 0<s<|p|, it implies 0<s²<|p|², and |p|²=p², so we have s²<p² implies s²-p²<0, it means <span>s²-p² is negative </span>the true response is <span>E. s²-p²</span>