While Attempting to Control One Type of Arrhythmia,antiarrhythmic Drugs Can

While attempting to control one type of arrhythmia,antiarrhythmic drugs can exert "proarrhythmic" effects,which are indicated by

A) a delay of 4 to 6 weeks before these drugs become effective
B) common musculoskeletal abnormalities such as skeletal muscle fasciculations
C) their ability to aggravate or initiate other cardiac rhythm abnormalities
D) their ability to aggravate the proton pump in the stomach, resulting in gastric ulcers
E) their ability to increase body temperature and cause fever