【单选题】If you're relying on Grandma to help with child care, it's time to reconsider. A new study of more than 54 000 women found that those who watched their grandkids 9 hours a week or more were 55% more l...
A.
grandparents take care of younger children
B.
young people be careful about their parents
C.
old women spend more time taking care of their own health