Answer:
solar energy will be used by many countries in the world in the future
What I usually do to start a thesis or intro is go off with a hook. so start it with why you like to draw. for example: drawing has always played an important role in my life. i want to teach others how to draw so they can understand and enjoy this art...etc, etc
Answer: Social media can teach people how to cook, how to make this, how to (etc.) you can use devices not just to call but to learn something too!
I'd go with B - Article. There are hundreds of good examples for the answer being B. For example, "a book" ('a' is an article - 'book' is a noun), "an apple" ('an' article - 'book' noun). Those are just the simple ones.
