Answer:
B. 10 units
Explanation:
Use the pythagorean theorem. (a^2 + b^2 = c^2)
Pretend that PQ is the hypotenuse of a right triangle.
Count the number of units for the supposed legs of the triangle.
The height would be 6 while the base is 8.
6^2 + 8^2 = PQ^2
36 + 64 = PQ^2
100 = PQ^2
PQ = 10
So, the answer is B.