Answer C has subject/verb agreement: Wasn't that rainbow after the thunderstorm just lovely?
The theme is used to convey the message/lesson of a text. For example, the lesson of “The Tortoise and the Hare” is that slow and steady wins the race. Therefore, the theme of “The Tortoise and the Hare” is that slow and steady wins the race. Hope this helps!
Do you have the options? But I would guess he borrowed from Love Labour's lost and The Tempest.
Engineers will often use reverse-engineering to solve problems. For example, by taking things apart to determine an issue, finding a solution and then putting the object back together again. Engineers know how things work, and so they constantly analyse things and discover how they work.