The excitability of skeletal muscles is decreased in acute hypokalemia because

A、Emvoltagebecomeslessnegative,andtheNa+channelisinactive;
B、Emvoltagebecomesmorenegative,thedifferencebetweenEm-Etincreases;
C、Etelevates,thedifferencebetweenEm-Etincreases;
D、Emvoltagebecomeslessnegative,thedifferencebetweenEm-Etdecreases;
E、Emvoltagebecomeslessnegative,thedifferencebetweenEm-Etdecreases