Which of the Following Is Not a Characteristic of a Multinomial

Multiple Choice

Which of the following is not a characteristic of a multinomial experiment?  

A) The experiment consists of a fixed number, n, of trials.
B) The outcome of each trial can be classified into one of two categories called success and failure.
C) The probability $p _ { i }$ that the outcome will fall into cell i remain constant for each trial.
D) Each trial of the experiment is independent of the other trials.