In the first sentence, the "he" is a nominative as it is a subject.
In the second sentence it is an object as the form "me" is actually "I", but "i" is a nominative form and "me" is an objective form.
In the third sentence "Us" is also used in objective form as "us" is an object of an action by "my sister".
Your answer would be B
If this answer is incorrect, then i am sorry
I think it would be answer D, to introduce an idea because it's introducing the idea of a Venus Fly Trap's diet.
The idea for national day to focus on the environment came to Earth Day
You should probably post the article
