You should take a deep breath
Think its a and b might be d but most likely not so yea
a and b
I think it would be answer D, to introduce an idea because it's introducing the idea of a Venus Fly Trap's diet.
I picked A because, you first have to find out what you wanna write about. This is something you should before finding the main points to put in your story, and your main idea. It can be about something you like, or something that makes your story interesting to read. Hope this helps!!!
An argument is valid only if it takes form in the impossible to make it seem true;)