Final answer:
The correct form of the verb 'sallr' that best fills the blank in the sentence is 'salí'. Verb conjugation in Spanish depends on the subject of the sentence.
Step-by-step explanation:
The correct form of the verb sallr that best fills the blank in the sentence is salí.
The sentence structure implies that the subject is 'yo' (I), which corresponds to the singular form 'salí' (I went out). The other options 'salieron' (they went out), 'salió' (he/she went out), and 'saliste' (you went out) do not match the subject of the sentence.
Remember that verb conjugation in Spanish depends on the subject of the sentence. In this case, 'yo' is the subject, so we use the conjugation 'salí'.
Learn more about Verb conjugation in Spanish