## **Core Concept**
The contraction of a family, also known as a family life cycle stage, refers to the period when a family unit reduces in size, typically as children leave home. This concept is often discussed in the context of family dynamics and sociology. Understanding the stages of family life cycles is crucial in various fields, including psychology, sociology, and social work.

## **Why the Correct Answer is Right**
The correct answer, **D. 3**, signifies that the stage of contraction of a family starts at the third stage of the family life cycle. Typically, the stages of the family life cycle are:
1. **Formation (or Beginning)**: When a couple gets married or enters into a committed relationship.
2. **Expansion (or Childbearing)**: When the couple has children.
3. **Contraction (or Child-Rearing)**: This stage begins when the children start to leave home, leading to an empty nest.
4. **Dissolution**: The final stage, which involves the dissolution of the family unit through divorce, separation, or death.

The contraction stage is characterized by the departure of children from the family home, which can significantly impact family dynamics.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent the stage of contraction in a typical family life cycle model.
- **Option B:** This option is incorrect because it suggests an earlier stage, likely corresponding to the formation or expansion stages, not contraction.
- **Option C:** This option is incorrect because it suggests a stage before contraction; it might represent a period of active child-rearing.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the family life cycle stages are dynamic and can vary significantly among different cultures and individuals. The contraction stage can be particularly challenging for parents as they adjust to an empty nest and may experience a range of emotions, from relief to depression.

## **Correct Answer: D. Contraction.**