Final answer:
b. Muscle weakness. When a client has a potassium level of 3 mEq/L, the nurse should expect the assessment finding of muscle weakness.
Step-by-step explanation:
When a client has a potassium level of 3 mEq/L, it is considered to be low (hypokalemia). The nurse should expect the assessment finding of muscle weakness in this client. Hypokalemia can lead to depolarization of skeletal muscle fibers, which can result in muscle weakness. It can also affect the function of the nervous system and the heart.