Biologists Surveying the Bacterial Flora of Yellowstone National Park, Particularly

Biologists surveying the bacterial flora of Yellowstone National Park, particularly populations located in the park's famous hot springs, have collected data on habitat characteristics, sequenced the DNA of bacteria from each population, and studied the physical characteristics of the cells. They have also compared what they know about these bacteria to other species already collected and identified from the park. Given this information, which species concept would the researchers be UNABLE to apply?

A) evolutionary species concept
B) biological species concept
C) ecological species concept
D) phylogenetic species concept