Bungee jumping is an exciting activity very popular among young adults courage matters

问题补充：

Bungee jumping is an exciting activity, very popular among young adults, courage matters more than strength.

A. whose

B. that

C. of which

D. where

答案：

A. whose

B. that

C. of which

(答案→)D. where

解析：定语从句，先行词是activity，相当于 in which，在从句中做地点状语。