You can already guess from the given details that S1 is loudest at the apex and S2 is loudest at the base. This means that D is the right answer. The lub sound can be heard at the apex portion of the heart. This is usually long and loud. The dub sound can be heard at the base portion. The sound of dub is sharper and usually higher as compared to the lub.
It will be hard to hear these things when you just check your pulse rating but it will be clearer when the doctor makes use of a good stethoscope. There are some that are better than others in helping doctors hear the proper heart sounds of patients.
S1 is loudest at the apex, and s2 is loudest at the base.-rationale: the s1 sound the lub sound is loudest at the apex of the heart. it sounds longer, lower, and louder there than the s2. the s2 the dub sound is loudest at the base. it sounds shorter, sharper, higher, and louder there than the s1.client needs category: physiological integrityclient needs subcategory: basic care and comfortcognitive level: knowledgereference: weber, j., and kelley, j. health assessment in nursing, 3rd ed. philadelphia: lippincott williams & wilkins, 2007, p. 355.