You answered incorrectly.
The correct answer is (b), “failure to demonstrate aortic valve opening by echocardiography” which occurs when the high systemic flow from the AV ECMO circuit impairs opening of the aortic valve which can be seen on echo. However, LV filling continues from the pulmonary circulation via the left atrium, thus distending the LV and increasing left ventricular end diastolic pressure (reflected in a rising PCWP. The consequence is worsening ischemia due to increased LV wall stress. Answer (a) is incorrect based on the rise in LV filling pressures and the loss of LV ejection reduces pulse pressure making option (c) incorrect, and consequently making (d) incorrect as well.