Which of the Following Would Violate the Principle of Independent

Which of the following would violate the principle of independent judiciary

A) Earle was voted out of office by the local population after the mayor ran a publicity campaign about Earle's most unpopular rulings.
B) Earle was impeached because he accepted a bribe.
C) Earle was removed from office by the governor at the request of the mayor.
D) Earle lost his judgeship because the court boundaries were changed to favor larger cities.