Answer:
The correct option is;
A. The rats would kill the mice
Step-by-step explanation:
The mouse that exist in the forest niche will continue inhabiting the niche because the introduced rats are cautious mammals
Whereby the population of rats increases and there is competition for food there is a likelihood that rats could kill the mice. However in plentiful supply of food, the two rodents could coexist
Given the nature of the niche which is shared and the differences in behavior of the rats such as muricide, the rats will kill and eat the mice as noticed in scientific studies over the past several decades.