B. As a gardener protects a new plant from a strong storm, the motorcycle police protectively surrounded the line of school buses from the angry bystanders.
Figurative language is the one that uses figures of speech in irder to be more effective and persuasive, producing a major impact on the reader. The literal meaning gets overpassed by it's use. Some figures of speech used in figurative language are: allusion, metaphor, alliteration, simile, imagerie and hyperbole.
In this case, option B uses simile to describe te image. Simile is used to make a coparison between two different thing, showing it's resemblance. It uses the words "as" or "like", making a direct comparison.