human
Question: Can you remember any of the bad habits you used to have when you were very young? Perhaps, as a baby, you used to suck your thumb . Of course, you do not do that any more, but you can surely remember your mother's efforts to train you. The good habits you now have in such matters as personal cleanliness were part of this early training. We may not suck our thumbs any more, but as we get older we get other bad habits. We can't give them up easily, either.(Anyone who has tried to give up smoking knows this very well!) Each period brings its own problems. In babyhood, it's thumb-sucking; in childhood, it's nail-biting; in our teens, it's smoking; in middle-age, it's over-eating, and so on. And if anyone tells you that he has no bad habits, you can be sure that he must have the worst habit of all. According to the passage, now we have good habits such as personal cleanliness, for which we benefit from   _  .

Choices:
A) the social conditions
B) some strict rules
C) our friends' kind help
D) our mothers' early training
gpt
The correct answer is 3: our mothers' early training.