Let's take what we know and go from there.
A. We know that the triangle Fran drew has no congruent sides, meaning that all sides are different lengths. Triangles of this type are never isosceles, since isosceles triangles have at least two congruent sides, so we can cross out choice A.
B. Scalene means that all sides are of unequal length. This is a truth about the triangle, since we know that no sides are congruent. We can mark B down as a correct answer choice.
C. An acute triangle is one which has no angles greater than or equal to 90°. We see in the text that there is a 90° angle in this triangle, so we can remove choice C from our list.
D. The triangle Fran drew had an angle with a measure of 90°. A right triangle has one angle with a measure of 90°, so Fran's triangle is also right. Choice D is one correct choice.
So there we have it.
The most accurate terms to describe the triangle that Fran drew would be scalene and right.
Hope that helped! =)
