The correct answer is A. Change "obviously creepy" to "unsettling."
Step-by-step explanation:
In general terms, a text is considered objective in the case it includes only facts and avoids personal judgments, perceptions, and options. In the case of the sentence "All of these descriptions mark Pearl as enchanting but also strange and obviously creepy" the phrase "obviously creepy" includes a personal perception and judgements from the author and therefore this should be changed to a more neutral one based on the facts such as "unsettling" as this describes the particular behavior of Pearl without judging her as "creepy". On the other hand, replacing this by "poorly behaved" still includes a personal judgment and the word "enchanting" is objective, which means it does not need to be changed. According to this, the change that would make the sentence more objective is "change "obviously creepy" to "unsettling".