PLEASE HELP!!

A certain grey squirrel population has lived in Tomlinson Run State Park, West Virginia, for more than 20 years. A red squirrel population was introduced into the park two years ago and has become a large competitor for food and other resources for the grey squirrel. There has also been a decline in the park’s grey squirrel population during the last two years. Which of the following best explains this scenario?

A) commensalism

B) Gause’s law

C) mutualism

D) Boyle’s law