Older inventions had vast improvements made on them.
I believe it’s a because the author specifically uses you, which calls the audience to act. hope this helped!
The main theme is the fragility of sanity, guilt versus innocence, and the unrelenting passage of time. The fragility of sanity: the narrator's attempt to prove his sanity, his erratic mannerisms while he explains his meticulous plans for killing the old man only prove his madness.
Answer:
1. He arrived late because he had an appointment elsewhere.
2. After much discussion, he approved the project.
Explanation:
B, because the colon is used to show an example or list of that subject being spoken about
