S1: Ecology, history and geography determine the distribution of organisms. S6: Others prefer to interpret bio geographical history through vicariance (range-splitting) events. P: Some historical biogeographers are interested in finding centre of-origins. Q: Most species distributions result from a combination of all these factors. R : But biogeographers tend to specialise in ecological aspects (ecological biography or historical aspects). S: Ecological biogeographers are interested in the effects of environmental factors. The correct sequence should be

Options

A. QRSP
B. RQPS
C. PQRS
D. SPRQ