Question

the following is told by a boy who is talking about his father. select the best detail to show the boys father is honest and genuine.
i was glad my father was an eye - smiler. it meant he never gave me a fake smile because its impossible to make your eyes twinkle if you arent feeling twinkly yourself. a mouth - smile is different. you can fake a mouth - smile any time you want, simply by moving your lips. ive also learned that a real mouth - smile always has an eye - smile to go with it. so watch out, i say, when someone smiles at you with his mouth but his eyes stay the same. its sure to be a phony.
from roald dahl, danny the champion of the world. copyright 1975 by alfred a. knopf

Explanation:

The text describes the father as an "eye - smiler" who never gives a fake smile. Since it's impossible to fake an eye - smile (as it requires genuine feeling), this detail shows his honesty and genuineness.

Answer:

"I was glad my father was an eye - smiler. It meant he never gave me a fake smile because it's impossible to make your eyes twinkle if you aren't feeling twinkly yourself."