The question lacks some context but I would say B) might be the right answer. Hope this helps!
I think that the italicized word is "trained" as it's a participle and there is no other participle or gerund! A participle is a verb form that can be used to modify a noun.
Answer:
1. Three dogs were bought by Rashma
2. The assignments were handed over by the pupils
3. The CD will be returned tomorrow by me.
4. Old people should be respected.
5. The textbook has been forgotten by Steve
Explanation:
Check screenshot
The go-to counter argument for this would be to say that it's not the responsibility of the advertisers to censor what the kids see--but rather the responsibility of the parents.