Ventricular Systole Events Steps:

• Identify ventricular systole as the contraction phase of the ventricles in the cardiac cycle.
• Recall that during this phase, ventricular pressure exceeds atrial pressure, closing AV valves.
• Note that ventricular pressure then exceeds arterial pressure, opening semilunar valves for ejection.
• Match events to options: select those aligning with contraction and ejection, excluding atrial activity.

Why B is correct:

• Option B (1 and 3) matches definitions of ventricular contraction increasing pressure (1) and blood ejection into arteries (3) per cardiac physiology.

Why the others are wrong:

• A includes 2 (atrial contraction, which occurs in atrial systole, not ventricular).
• C includes 2 (incorrect timing for atria) but misses key ventricular pressure rise.
• D omits 1 (ventricular contraction essential for systole).

Not enough information on exact statements 1-3 for full verification.

Final answer: B