A Multiple Choice Exam Offers Four Choices for Each Question

Multiple Choice

A multiple choice exam offers four choices for each question. Paul just guesses the answers, so he has probability 1/4 of getting any one answer right.
Paul's guess on any one question gives no information about his guess on any other question. The statistical term for this is

A) absence of bias.
B) absence of confounding.
C) law of large numbers.
D) independence.
E) expected value.