A nurse is collecting data from a 1-week-old infant who is scheduled for a cardiac catheterization. Which of the following locations should the nurse palpate in order to identify the infant's point of maximal impulse? (You will find hot spots to select in the artwork below. Select only the hot spot that corresponds to your answer.)

A (Left midclavicular line, 4th to 5th intercostal space): In infants, the point of maximal impulse (PMI) is best palpated at the 4th intercostal space at the left midclavicular line. This is where the apex of the heart lies and where the ventricular contraction is most prominent. It is the proper site to assess PMI in a 1-week-old infant. B (Near the xiphoid process): This location is too low and central to accurately assess the PMI. Palpation here would more likely reflect epigastric pulsations or a transmitted impulse, which are not reliable indicators of left ventricular activity in infants. C (High on the sternum): This location is at the 2nd or 3rd intercostal space, which is too high to assess the PMI in an infant. This area is used more for evaluating aortic or pulmonic valve sounds, not the apex of the heart.