This group mainly investigated the processing methods of Evodia rutaecarpa and Polygonum multiflorum Thunb. Processing of Evodia rutaecarpa: take slices or pieces of Glycyrrhiza uralensis Fisch., add appropriate amount of water, decoct to remove residues, add washed Evodia rutaecarpa Fisch., moisten and blot, then put in a hot pot, fry with slow fire until slightly dry, take out and dry; Preparation of Polygonum Multiflori Radix: Slice or block raw Polygonum Multiflori Radix, mix with black bean juice, moisten, put into colored steaming container, seal, stew until the juice is completely absorbed, and take out and dry when the juice is brown. So the answer is B.