Which of the following elements make bungee jumping relatively unsafe? a. difficulty in measuring accurate cord lengths for each jump. b. possibility of neck, back, joint, or eye injury from the jolt. c. inability to train for a jump. d. lack of fitness benefit to be derived from it.

The answer would be 
B.) Possibility of neck, back, joint, or eye injury from the jolt.

When you jump, you're going straight down at a high speed and then when you reach a certain point, you're restricted and jolted. You can hurt your neck from flinging your head around, hurt your back/joints from twisting around, something could fly into or you could hit your eye.

Hope this helps!

B possibility of neck, back, joints, or eye injury from the jolt