Which of the following is a nuclear family?

The correct answer is Option A: A family in which one husband, wife and their children live together.

In sociology, a "nuclear family" refers to a family unit consisting of two generations: the parents (one husband and one wife) and their children living together as a single household. This is often considered the basic or traditional family structure in many societies. Here's an explanation of the other options:

- Option B: This describes an extended family, where not only the husband, wife, and children but also other relatives like brothers, their wives, and children live together. It's a larger family structure than the nuclear family.

- Option C: This describes a nuclear family as mentioned in Option A, where only the wife and husband live together with their children.

- Option D: "None of the above" is not the correct answer because Option A accurately describes a nuclear family, which is a recognized concept in sociology.

So, the correct answer is Option A: A family in which one husband, wife, and their children live together, which represents the typical definition of a nuclear family in sociology.