89. Which of the following statements about the declining-population approach to conservation is not correct? (A) IHumans may not be the cause of every population decline. (B) We need information on whether or not the population in question is in decline. (C) We need to do something quickly, even if we have no information, because conservation biology is a crisis discipline. (D) A proposed reason for the decline should be tested experimentally. (E) Several hypotheses about why the population is declining should be evaluated.