I would definitely say B.) A smile because if you were just staring it may be rude or distracting to the speaker and a smile shows you are listening and absorbing the knowledge
A conflict in a story creates and drives the plot and story toward. The conflict in a novel is usually something happening between two “people” or forces. If you can check my page and answer some of my questions that would be sweet.
The tense is all mixed up, but it looks like present is used most often, so "emitted" should be changed to "emits" and "pulled" should be changed to "pulls." I can't see the entire paragraph so just make sure that's consistent.
You don't need a comma in "running towards us with the fire extinguisher."
"Your mother and me" should be "Your mother and I." For reference try taking our "your mother" - it sounds pretty silly to say "me thinks" unless you're in the 1600s, right? And it should be "think" instead of "thinks."
The sieve filters the sand and you get resources out of it.
Though a bit lengthy (which is absolutely fine!) you seem to go into some good detail while withholding main points for the rest of your paper and it is very well done!
