Answer:
Love
Step-by-step explanation:
Under this circumstance, Brian might end up reacting to the smiling passerby with a feeling of love. This would be a consequence of a process known as excitation transfer. Excitation transfer occurs when the residual excitation from one stimulus amplifies the excitatory response to another stimulus. However, the hedonic valances of the stimuli might be different. In this case, the excitement that Brian feels from the ride might affect his reaction to the smile.