<span>B.<span>referenced source material</span></span>
This is speculation, so please get a second opinion.
I think it's c, because the adults, in this passage, are teaching children how to behave, and therefore a and b are ruled out. d could have possibly been one, but I think that it would not be, because the adults are not explicitly setting clear examples for their children.
Again, you should get a second answer before you answer this.
Answer: to
Explanation:
To indicates direction, and it completes the sentence.
I am going
TO school now.