Tyree is a skilled cyclist. when practicing on a stationary bike, his coach finds that when the women's cycling team enters the gym, his speed seems to increase significantly. tyree's increase in speed illustrates

Tyree's increase in speed illustrates "Social facilitation".

Social facilitation refers to the propensity for individuals to perform distinctively when within the sight of others than when alone. Contrasted with their execution when alone, when within the sight of others, they have a tendency to perform better on straightforward or all around practiced assignments and more regrettable on unpredictable or new ones.

Icould be wrong but i would say b.