Answer
B. The lengths of the legs and the length of the hypotenuse.
Step-by-step explanation
The Pythagorean theorem deals with a right triangle. It is concerned with the lengths of the legs and the hypotenuse.
If the lengths of the legs are a and b nd the hypotenuse is c, the the pythagorean theorem says,
a²+b²=c²
c²-a²=b²
c²-b²=a²