At which labeled point in the following graph are the first eukaryotes thought to have evolved?

Question

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The first eukaryotes are thought to have evolved around 2 billion years ago, which is represented by point B on the graph. This is because this is when the first evidence of eukaryotic organisms and their complex cellular structures appear in the fossil record. Points A, C, and D are all before this time period and do not show the emergence of eukaryotes.

At Which Labeled Point in the Following Graph Are the First