The German chancellor and dictator, Adolf Hitler, whom historians have noted had a hypnotic effect on large audiences, once debarred from public speaking, so he had to appoint Gregor Strasser to advance his political ambitions.

A: The German chancellor and dictator, Adolf Hitler, whom historians have noted had a hypnotic effect on large audiences, once debarred from public speaking, so he had to appoint

B: Once debarred from public speaking, the German chancellor and dictator, Adolf Hitler, whom historians have noted had a hypnotic effect on large audiences, had to appoint

C: The German chancellor and dictator, Adolf Hitler, who historians have noted had a hypnotic effect on large audiences, was once debarred from public speaking, so he had to appoint

D: The German chancellor and dictator, Adolf Hitler, whom historians have noted had a hypnotic effect on large audiences, was once debarred from public speaking, and appointed

E: The German chancellor and dictator, Adolf Hitler, who historians have noted had a hypnotic effect on large audiences, was once debarred from public speaking, so he had appointed

Source: e-gmat SC Ability;