The lower half of the body is labeled

Depending on your class and subject determines the answer. For example the legs can be extremities, or the legs can be distal from the trunk(torso) etc

It would be b. distress

Well, l think that some effective communication is, emotional barriers and lack of attention, interest distraction or irrelevance. also some physical disabilities such as hearing problems or speech difficulties.      l hope i am correct  and you good luck.