Lyla and Emily are two ballet performers and they are practicing rotating. Lyla is rotating clockwise with a constant angular velocity of 90 degrees per second. Emily is rotating anticlockwise and her rotation is speeding up (accelerating). If we measure Lyla and Emily's vestibular system response, whose hair cells have a higher firing rate?

a. Lyla b. Emily c. the same d. not sure: it's depended on the initial velocity of their rotation e. not sure: it's related to two people's height and weight.