It means "aunt on the mother's side".
The answer to eliminate is C: to inform the public about the health benefits about the benefits of eating fruits & vegetables. Eating plenty of fruits and vegetables has been associated with a reduced risk of developing many types of cancer. This point is no longer valid to a person that has already developed cancer, and must now receive chemotherapy as treatment. The more useful points would be to explain the role of an oncologist and to have a young survivor speak to their experiences. An Oncologist will be the doctor in charge of prescribing and overseeing treatment, so it is important that patients know what issues can be addressed via this route. A cancer survivor will give insight as to what to expect during chemotherapy, how to best deal with side effects and how to navigate the healthy system.
It is likely that Tom picks Myrtle because he thinks she will be an easy woman to control. She is not wealthy, powerful, or socially connected, so she doesn't pose much of a threat to him. Myrtle also readily accepts Tom's fabricated story about being unable to divorce Daisy because "she's a Catholic."
