According to the Text,what Does the Term "Sandwich Years" Refer

According to the text,what does the term "sandwich years" refer to?

A) the period of time parents need to pack lunches for their children to save money
B) the period of time couples are squeezed by both the older and younger generations
C) the period of time children are squeezed by demands from both the school and their parents
D) the period of time children are young enough to enjoy going on family picnics