Which of the Following Studies Would Provide a Community Ecologist

Multiple Choice

Which of the following studies would provide a community ecologist with the most pertinent data with which to investigate competitive interactions?

A) selectivity of nest sites among cavity-nesting songbirds
B) the grass species preferred by grazing pronghorn antelope and bison
C) stomach analysis of brown trout and brook trout in streams where they coexist
D) all of these