The sentence is in the past tense.
Past tense is the tense shown in the sentence: 'Last spring, a pair of wrens built a nest and laid eggs in my flower pot.'
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A. Past tense
Past tense is typically used to discuss what happened in the past, or before a current event. In English, past tense is typically represented with 'ed' added to the end of verbs such as 'witnessed', 'needed' and 'liked'.
In many special cases, they are written differently, like 'said', 'grew', were' and 'spoke'.
In this sentence, the two verbs using the past tense are 'to build' and 'to lay', which are 'built' and 'laid' in past tense.
Learn more about tenses here: https://brainly.com/question/37569355/n