Concept:The phrase “in the class” shows Joseph is being compared with more than two people, so the superlative form is needed.Explanation:“Clever” has two common comparative and superlative forms: cleverer/cleverest or more clever/most clever.The sentence uses “the” before the blank, which signals a superlative.Among the options, “cleverest” is the correct superlative form.Answer:B. cleverest