Answer:
C. We should continue efforts to save this beautiful, endangered species.
Step-by-step explanation:
The sentence that best complements as a conclusion to the introduction given here is displayed in option C, i.e. 'We should continue efforts to save this beautiful, endangered species'. It exemplifies the author's message and purpose clearly and effectively. It contains the essence of closure and reflects the concluding remarks with a message of the author that he conveys to the audience i.e. to make efforts to preserve the precious endangered wildlife species.