According to the context, the correct Spanish article to complete the sentence is "la".
What is an article?
In Spanish, it is a kind of word that accompanies the noun in a sentence and presents variation of gender and number.
In the sentence "¿Vas a llamar a Elena esta noche? Sí, la voy a llamar", "la" is the correct option since it’s a feminine singular article agreeing with the subject which is feminine (Elena).
Therefore, we can conclude that according to the context, the correct Spanish article to complete the sentence is "la".
Learn more about Spanish articles here: https://brainly.com/question/13250041
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