Final answer:
Large U waves on an EKG are associated with hypokalemia, which is a low potassium level in the blood. Hyperkalemia, an elevated potassium level, is not associated with large U waves.
Step-by-step explanation:
The presence of large U waves on an EKG is associated with hypokalemia, which is a low potassium level in the blood. Hypokalemia can affect the function of the heart and lead to various EKG abnormalities, including the enlargement of U waves.
Hyperkalemia, on the other hand, is an elevated potassium blood level, which can impair the function of the heart but is not associated with large U waves on the EKG.
Therefore, the correct answer is B) Hypokalemia.