Answer:
E. Alex does not exhibit aggression when offered a gesture that he specifically requested.✔
Step-by-step explanation:
A. Dolphins can be trained to assist divers in ocean rescues.❌
Option A States that dolphins went through some certain training. We can say training is a one-way process unlike communication which is a two-way process.
B. Gorillas in captivity often learn hand signals for food and water.❌
Options B can be considered wrong in this context as gorillas can be placed in the primate classes based on the argument.
C. Dogs are capable of sensing their owners' moods and often exhibit concern if they sense sadness.❌
Dogs are capable of sensing. In this case, it is not equivalent to communication.
D. Chimpanzees can memorize long sequences of key punches on machines that dispense food.❌
Options D can be viewed as wrong in this area as chimps can be categorized in the primate zone based on the case study.
E. Alex does not exhibit aggression when offered a gesture that he specifically requested.✔
It speaks about communications as Alex is interacting with humans as seen in this case, most likey its master.