The correct answer is C anecdotal. An anecdote is a personal account of events, it tipically narrates a situation or sequence of events that the writer has experienced. It can be used to illustrate an empirical observation. Empirical observations and statistics are objective evidence, so they do not entail personal experiences. In other words, anecdotes are subjective, that is related to the writer, while the others are objective, that is scientific and without personal information.