<h2>Hello!</h2>
The anser is: Anoche Sara fue a la casa de una amiga.
<h2>
Why?</h2>
The statement is referring to what Sara did last night (anoche), in this case, she went(fué) to a friend's house. It's referring to an action done in the past, so, let's discard each given option in order to find the correct answer:
Anoche Sara fue a la casa de una amiga, correct: "Last night Sara went to friend's house", the given option is referring to the simple past of the verb "go" (went), talking about when it happened, it was "last night" (anoche).
Mañana Sara fuiste a la casa de una amiga, incorrect: We can know that it's incorrect since it's talking about a future action "Mañana" (tomorrow), besides there are some grammar issues related to the grammatical person and the verb conjugation.
Anoche Sara iba a la casa de una amiga: It's incorrect since it's referring to something that did not happen, but there was at least an intention.
Mañana Sara fui a la casa de una amiga: Like the second option, there is incorrect since it's talking about a future action that will happen tomorrow (mañana) and there are some grammar issues related to the grammatical person and the verb conjugation.
Have a nice day!
