Which of these would most likely result in a change to the current classification of an organism?

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"Which of these would most likely result in a change to the current classification of  an organism?  A- Discovering organisms with similar physical traits in the fossil record  B- Finding a related organism that was previously considered extinct  C- Linking the organism to different ancestors through DNA sequencing  D- Observing organisms that occupy the same ecological niche. "

C- Linking the organism to different ancestors through DNA sequencing  

Explanation:

To formulate the oldest classifications, ecological and physiological characteristics were used, as well as all others that are available for the taxa in question. However, in recent years, classifications based on the similarity between genomes have been attempted, with great advances in some areas, especially when those from other fields of Biology are added to this information. Because of this evolution in the classification technology, a change in the current classification of an organism could occur by linking the organism to different ancestors through DNA sequencing.

The classification of living beings is part of the systematic, science that studies the relationships between organisms, and which includes the collection, preservation and study of specimens, and the analysis of data from various areas of biological research.