It is when the direct object is another person. It helps clarify it.
Example: Jorge llama a Maria. (Jorge calls Maria)
Studyspanish.com has a good description of it as well. http://studyspanish.com/grammar/lessons/persa
Amable would be the best answer because its a friendly gesture.
C. es
spanish was my first language so I know its right
Jome, home, dome, chrome, phone, throne, stone
What quiz are u talking about there is no question