Wow, cool! I just ran into this same problem and googled for it, so here I am.
By the day, what the heck is with her "x occurs at the y phase in the cardiac cycle", and then she chooses some event that occurs at the junction of two cycles? What a weird thing to do. Like, one question goes "When is ventricular volume the lowest" and two of the answer choices are "isovolumetric contraction" and the other is "rapid ventricular filling" (p 104 q 45). Answer is "rapid ventricular filling" 😡😡
I should add that the professors at my school love to write horrible problems like these for exams...