A woman becomes pregnant five days after her last sexual encounter. What is the most likely explanation for this?
A) Her partner's sperm are unusually strong and long-lived.
B) Her partner's sperm swam slowly and reached the oviduct very late.
C) Sperm held in quiescence and released gradually fertilized a just-released egg.
D) Surviving sperm waited at the distant end of the oviduct, waiting for an egg to be released.
E) The egg and sperm encountered each other immediately, but fertilization was delayed five days.
Correct Answer:
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