Which sentence uses a prepositional phrase?
a. the gold and brown puzzle pieces are the cat's head.
b. some jigsaw puzzles have 500 pieces.
c. can you put that jigsaw puzzle together?
d. put these puzzles on the shelf.

the correct answer is a. how to make proposal that works.

indeed, the register is quite formal and the tone is especially objective as it avoids the use of the first and second person singular (i, you) and opts instead for the third person plural which is more impersonal and focuses on the data and the argument that is being developed by the author. the formality adds the impression of respectability to the work and the impersonality adds objectivity to it.

greet them:

buenas noches.

that is considered night time which is when "good night" is used.