To determine how many cells are in anaphase, one would typically need to observe a sample under a microscope during cell division. Without specific data or observations provided in your question, I cannot definitively say how many cells are in anaphase based solely on the answer choices.
However, if you need to select an answer based on your observations or a specific experiment's results, you would choose the number you noted. Please let me know if there's a specific context or if you have observed a particular sample, and I can assist you further!
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