Final answer:
The sentence "Yo la miré ir por la calle" translates to "I watched her go down the street".
Step-by-step explanation:
The sentence "Yo la miré ir por la calle" translates to "I watched her go down the street" in English. The subject pronoun "Yo" translates to "I", the determiner "la" translates to "her", the verb "miré" translates to "watched", and the phrase "ir por la calle" translates to "go down the street". Therefore, the correct answer is option B: I watched her go down the street.
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