Read the following sentence. the callous remarks of the military leader led to a revolt by the oppressed minority whom he described as "useless." in which of the following sentences does callous have the same meaning as in the sentence above? the workplace safety survey showed that employees exhibited callous hands due to using hammers for long periods without wearing protective gloves. during the research study, scientists observed that all three hamsters developed callous feet when they ran on a metal wheel for long periods of time. as a protective measure, the epidermis, or outer layer of skin, can develop callous areas when exposed to constant friction and pressure. the anthropology professor advised his students to develop a callous attitude toward the people they were studying to prevent bias in their research. the judge found the doctor guilty of malpractice because she left the patient alone during the surgery, which showed a callous disregard for the patient’s safety.