Answer:
The answer is C.
.
Explanation:
In order to determine the length of the hypotenuse, we have to know the pythagoras theorem.
The Pythagorean Theorem is a formula relating the lengths of the three sides of a right triangle.
If we take the length of the hypotenuse to be "m" and the length of the legs to be "h" and "k" then:

So, according to the problem, we have a right triangle and the values of both legs. Therefore it is possible to determine the hypotenuse:
h=4 in
k=6 in

Finally, the length of the hypotenuse in inches is C.
.