Which Statement Best Describes the Risks of Electroconvulsive Shock Therapy

Which statement best describes the risks of electroconvulsive shock therapy (ECT)

A)  Risks are so severe that the use of ECT has been banned by law. 
B)  Risks may include both short- and long-term intellectual impairment. 
C)  Risks have been eliminated by modern improvements in the procedure. 
D)  Risks are negligible, as long as appropriate precautions are taken.