Label Each of the Following with "D" for Density-Dependent or "I

Label each of the following with "D" for density-dependent or "I" for density-independent factors.
A) _____ the presence of a predator reduces prey populations by 50%
B) _____ competition for the same food resources
C) _____ pollution in a river wipes out 50% of fish population
D) _____ a winter storm wipes out 75% of a population
E) _____ a flood drowns 80% of mammals