Which method of communication includes vocalizations and visual stimuli?

The correct choice pertains to animal signals, as this form of communication encompasses both vocalizations and visual stimuli used by animals to convey information to one another. Vocalizations could include sounds such as calls, chirps, or growls, while visual stimuli could involve body language, color display, or movements.

Animal signals are an integral part of how species communicate about a variety of topics, including mating, territory, and alarm calls. This method is characterized by its dual modality, allowing animals to convey complex messages through sound and sight, which can be crucial in their social interactions and survival strategies.

Other methods of communication listed, such as written communication, rely solely on text or symbols, while formal and informal communications can encompass various styles and mediums but do not specify the combination of vocalizations and visual cues as defined in animal signaling.