Take another look at the sentence:

When Diane takes her beagle for a walk, Santana enjoys sniffing for edible garbage, __________, and lunging at squirrels.

The blank requires a gerund phrase. You chose howls at bicyclists, which includes the simple present tense and thus causes a parallelism error.

Before you continue, review the rules for parallel structure.

Go back to the sentence to try again.

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