Answer:mental life; observable behavior
Explanation: Mental life has a lot to do with how psychologists focus more on the physiological research in the 1920s and 1960s, but as times goes by, they emphasize more on observable behavior. Because both mental life and observable behavior work together for a good psychological result.
Homicide because you yourself would still be alive
Given the attitude of the grandfather portrayed in the problem, the most likely answer is
B) Go to the doctor regularly because he can monitor his health before problems get severe.
This would be because you are reminded, "prevention is the best medicine", and the answer B provides the precaution that is recommended.
