El destino final del camino es el/la en santiago.
a.
restaurante “santiago”
c.
refugio
b.
hospital
d.
catedral

d.) Catedral

Entire sentence: El destino final del Camino es la Catedral en Santiago.

Translation: The final destination of the Camino is the Cathedral in Santiago.

Explanation: Many pilgrims walk the Camino de Santiago to arrive at Santiago Cathedral in Spain, which houses the relics of St. James.

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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.