Final answer:
The sentence in the excerpt that is not objective is "Finally, the world acted." because it suggests a value judgment by using the word 'finally'. The other sentences provide factual information, such as the banning of the ivory trade and elephant population figures.
Step-by-step explanation:
The sentence from the excerpt that is not objective is "Finally, the world acted." The word finally suggests a value judgment, indicating relief or satisfaction that action was taken, which introduces subjectivity into the statement. The other sentences in the excerpt are objective because they provide factual information without expressing personal feelings or opinions. Sentence A mentions the banning of the ivory trade by CITES, which is a factual statement. Sentence B states the elephant population figure, which is also factual. Lastly, sentence D describes the effect of the ban by stating elephants made a comeback, which could be supported by population data, making it a factual claim as well.