Karina lives in a single-parent family with her mother. Her mother works full time during the week and has another part-time job on the weekend but does not make enough money to cover all the family bills. Karina must also work a part-time job to help. Karina's family exemplifies how

A. communication styles influence family
B. economics and education influence family
C. ethnic and cultural backgrounds influence family
D. genetics, health, and diet influence family