What Does the Term "Sandwich Generation" Refer To

What does the term "sandwich generation" refer to?

A) dual-earner couples who are so busy with their careers they do not have time to cook
B) young adults who are employed in low-paying jobs with few prospects for promotion
C) middle-aged adults whose children are dependent and whose parents have increasing disability
D) young lone parents who live with their own parents and also care for their children