Answer:
B. Extensive muscular weakness, followed by paralysis
Step-by-step explanation:
Low plasmatic concentrations of potassium have a large effect on all muscular cells since this ion is involved in maintaining a electric potential difference between the interior and the exterior of the cell.
The electric potential difference is a key piece of muscular contraction. Therefore, when some point of this mechanism is affected, like in this case, by lower concentrations of potassium, there is muscular weakness that can end up in paralysis.