Gey had Mary sample Henrietta's tumor, as shown in option A.
Gay is responsible for a scientific project that seeks to create the first line of immortal human cells. He wants to do this through Henrietta's cells.
At the beginning of the fourth chapter, Gey tells Mary that Henrietta's biological material has arrived and that she must collect the tumor samples. It makes her very excited.
This question is about "The Immortal Life of Henrietta Lacks."
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