Since we don't have an image of the rectangular prism or the sketches, we cannot determine the correct answer.
However, in order to find the length of the diagonal of a rectangular prism, we can use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides.
Therefore, if we have a right triangle whose two shorter sides are the dimensions of the rectangular prism, we can use the Pythagorean theorem to find the length of the diagonal.
If any of the sketches do not form a right triangle, or if they do not include the necessary dimensions of the rectangular prism, they cannot be used to find the length of the diagonal.