Which of the following statements reflects one of the reasons men communicate?
a "td like to focus on developing a plan of action for this project"
b. "the first thing we need to do is research possible subjects."
c. "who is going to be responsible for writing the outline? "
d. all of the above

ah, so ustedes and nosotros are my 'go-to' if i am using spanish mainly in the states? interesting, but still slightly confusing, haha."

it seems that you are a little confused about subject pronouns. yo=i, tú/usted=you, nosotros=we, ustedes=you(plural), ellos/ellas=they.

in the case of vosotros, it is an informal replacement for "ustedes" in spain. similar to using "you all" in english.

even though it is not generally used in conversation outside of spain, it is used many times in literature. i would suggest having at least some familiarity to that form, at least to recognize what it is.