What Does the Term "Sandwich Generation" Refer To

What does the term "sandwich generation" refer to?

A) mid-life childless couples whose career demands conflict with their desire to spend time with their family
B) middle-aged adults who provide assistance to both their children and their aging parents
C) middle-aged workers who find themselves trapped between dissatisfaction with their job and financial obligations to their family
D) two-income families where the family members' busy schedules mean that meals are seldom eaten together as a family