Concept:Compound adjectives with numbers use a singular noun form, so “five-man” acts as one modifier.Explanation:The sentence needs an adjective before “panel” that means “made up of five men.”In English, such compounds take a singular noun: “a five-man panel,” not “five-men panel.”Possessive forms like “five-man's” or “five-men's” are not correct here.Answer:B. five-man