Concept:The word "endure" means to tolerate or withstand something difficult or painful.Explanation:The sentence says the porter could not "endure" his insults.This means the porter was unable to tolerate or put up with the insults.Among the options, "accept", "agree", and "approve" suggest a willingness or permission.Only "bear" means to suffer or tolerate patiently, which is the closest match to "endure".Answer:D. bear