These are the correct choices because B. There is a right angle marked, meaning it has to be a right triangle. and E. because all of the side lengths are different, which is what a scalene triangle is (all the sides are different lengths).
It is none of the other options because none of the sides are the same length. None of the angles are greater than 90 degrees. not all the angles are less than 90 degrees and again there aren't any congruent sides. <span />
