These questions need your child to work something out from the story.
Why did the Billy Goats want to cross the bridge? (they had run out of grass and they were hungry)
What did the little Billy Goat feel like when the troll jumped up in front of him? (he was scared, he is shaking in the picture and the troll is shouting)
The answers might be slightly different but they need to add something to the writing that shows they understand why the characters behave as they do, or what the outcome might be because of their actions.