A student is trying to avoid rereading an entire original LSAT-style passage about species concepts in taxonomy. The passage map reads: P1 reviews biological species definitions based on interbreeding; P2 explains that fossils, bacteria, and hybridizing plants often do not fit that model cleanly; P3 argues for pluralism because different research questions require different criteria; P4 rejects the idea that pluralism means anything goes. The question asks why the author endorses pluralism about species concepts. Which plan most directly locates the needed support?