Answer: Karen
Explanation:
Because the fertilization of an egg by a sperm occurs in the fallopian tubes, Karen will not be able to conceive without In Vitro Fertilization (IVF).
In Vitro Fertilization (IVF) is a process that involves fertilizing an egg (oocyte) with a sperm outside the woman's body. If the fallopian tubes are only partially blocked, a woman has more options such as having a surgery to remove scar tissue or create another opening.
A woman who is having trouble ovulating or not ovulating at all can still conceive through ovulation induction, a chemical way of stimulating the release of an oocyte.
Ruth, who is having trouble carrying a child to term can employ the services of a surrogate mother.
