The sentence from the passage that best supports the author's claim that Henrietta's cells have been widely used by scientists is: A) "If we went to almost any cell culture lab in the world and opened its freezers, he told us, we'd probably find millions-- if not billions-- of Henrietta's cells in small vials on ice."
A claim is an opinion about a given subject. To support the claim that Henrietta's cells have been used widely by most scientists, there should be concrete proof that indicates this.
In option A, the supporting evidence shows that in virtually any cell culture lab in the world, Henrietta's cells can be seen in small vials. This proof best supports the claim.
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