What is the signal for fair ball? A.
Both arms extended straight out to the sides
B.
One arm extended straight out to the side
C.
Both arms straight up
D.
One arm up with the hand in a flst

What makes the yardstick test a direct measurement of reaction time? a. the further the yardstick falls, the slower the reaction time. b. yardsticks have numerical markings for length. c. yardsticks are designed to measure reaction time. d. all of the above select the best answer from the choices provided.