Physical Assessment of a Client with Cardiac Dysrhythmia Reveals Hypoactive

Physical assessment of a client with cardiac dysrhythmia reveals hypoactive bowel sounds, muscle weakness, dizziness, postural hypotension, shallow respirations, increased fatigue, and decreased tendon reflexes. The laboratory result consistent with these findings is

A) serum calcium level of 4.3 mEq/L.
B) serum magnesium level of 1.3 mEq/L.
C) serum phosphorus level of 1.1 mEq/L.
D) serum potassium level of 3.0 mEq/L.