21. The author uses a direct quotation (sentence 4) to

Answer: C

Explanation:

The author uses a direct quotation to place Ardi in the context of other discoveries.

The quotation highlights the significance of the discovery of Ardi by comparing it to the earlier discovery of the "Lucy" skeleton, thereby situating Ardi within the broader narrative of human evolutionary findings.

A) present a skeptical opinion about Ardi

This option is incorrect because the quotation does not express skepticism; rather, it emphasizes the importance of the discovery and its implications for understanding human origins. The tone of the quote is enthusiastic and affirmative, not doubtful.

B) provide eyewitness testimony about Ardi

This choice is also incorrect, as the quotation does not serve as eyewitness testimony. Instead, it reflects a scholarly opinion on the significance of the discovery rather than a direct observation of Ardi herself.

C) place Ardi in the context of other discoveries

This is the correct answer because the quotation explicitly references the "Lucy" skeleton, indicating that the discovery of Ardi is a significant milestone in the ongoing exploration of human evolution. It contextualizes Ardi's discovery as part of a lineage of important paleontological finds.

D) give a physical description of Ardi

This option is incorrect because the quotation does not provide any physical description of Ardi. Instead, it focuses on the importance of the discovery relative to past findings, lacking any details about Ardi's physical traits.

Conclusion

The correct answer, C, effectively captures the essence of the quotation by highlighting its role in situating Ardi within the larger framework of significant discoveries in human evolution. Other options fail to accurately represent the purpose of the quotation, as they either misinterpret its tone or overlook its contextual significance.