What term refers to a committed romantic relationship in which a couple lives together without formal marriage?

• A. Linked Lives
• B. Organ Reserve
• C. Menopause
• D. Cohabitation

Answer: (D)

The concept here is how intimate relationships are formed and sustained without marriage. Cohabitation refers to a committed romantic partnership where the couple lives together in the same home without getting legally married. This term specifically describes the living-together arrangement and is used in lifespan development to study how such setups influence relationship stability, parenting, finances, and social recognition as societal norms shift.

Why this fits best: it directly captures the situation described—two people in a committed relationship choosing to live together without formal marriage.

Why the other terms don’t fit: linked lives describes how family members’ lives influence one another across generations, not a dating or living arrangement; organ reserve is a physiological concept about the body’s capacity to respond to stress and aging; menopause is the biological transition marking the end of reproductive years in women.