Answer: The right answer is the A) Expository.
Explanation: Just to elaborate a little on the answer, it can be added that the word expository derives from the Latin exponĕre, which can be translated as to set forth. To set forth is to explain, in a clear and organized way, and either in writing or in a speech, facts, beliefs, and other sorts of information. The other three types of texts are not characterized by being straightforward and objective.