Concept:A somnambulist is a person who walks or performs activities while asleep.Explanation:The given phrase describes sleepwalking behaviour.“Somnambulist” is the exact one-word term for a sleepwalker.“Chauvinist” means a person with excessive patriotism or bias.“Ventriloquist” means a person who speaks without moving the lips.“Misogynist” means a person who hates women.Thus, “Somnambulist” correctly matches the group of words.Answer:B. Somnambulist