Final answer:
In a hot vinyasa class, Sun Salutation A and B sequences typically involve holding the Downward Dog pose for five breaths, offering a balance of stretch, strength, and rest.
Step-by-step explanation:
In a hot vinyasa class, the number of breaths taken during the Downward Dog pose can vary depending on the style of the instructor and the flow of the class. However, in the Sun Salutation A (Sun A) and Sun Salutation B (Sun B) sequences, it is common practice to hold the Downward Dog pose for five breaths. This provides enough time to stretch and strengthen the body while also allowing a moment of rest and recovery between more challenging poses. Therefore, the answer to the question is B) 5.