Sometimes,the Decline of One Species Threatens the Survival of Another

Sometimes,the decline of one species threatens the survival of another species.Which scenario is an example of this?  

A) Declines in polar bears result in diminished prey populations
B) The arrival of sailors on Mauritius island led to the extinction of dodo birds
C) Declines in eagle populations due to the accumulation of pollutants in their eggs
D) Decline in buffalo caused a drop in native buffalo clover
E) Pollution led to declines in the Texas blink salamander population