I think the answer is b which is third person limited
4) Time-consuming lab work
3) Exhaustive note taking
It's asking you proof that Ramirez is a demanding teacher not about the course itself so it is not 1, 2, 4 or 6. It is 4 and 3 because it shows Ramirez was demanding by enforcing a heavy load of work
"Focused on helping his neighbors" is a participial phrase. A phrase is made up of a group of words, without a subject and a verb. It functions as a single part of speech. A phrase consists of a participle and includes modifiers and complements.
False, unless the the personal experience is part of the context, but I highly doubt it is.
