Which of the Following Is the Best Example of a Sandwich

Which of the following is the best example of a sandwich generation?

A) When Bill was in college he lived with his grandfather who had begun to experience failing health.
B) Vermajit Punjab is a successful investment counsellor whose career obligations and responsibilities conflict with his desire to spend more time with his young children.
C) Elena Martinez would like to quit her present job and start her own restaurant, but she is afraid that such a financial risk might jeopardize her ability to provide for her children.
D) In addition to working full-time, Mr. and Mrs. Ross take care of a grandchild while the child's parent works, and they also provide a home for Mrs. Ross's mother who has arthritis and diabetes.