Imagery uses descriptive language to communicate the visual aspects of settings and characters. In this case, Quotation "A" best represents this concept.
Quotation "A" uses colorful adjectives to describe the setting. "...fine, cold drizzle" and "...risen from its uncertain puffs into a steady blow" help the reader establish a clear picture of the weather.
The second sentence describes the foot passengers as hurrying "dismally and silently" with "coat collars turned high" and "pocketed hands." This further emphasizes the bleak weather and the dismal undertones.