Step 1: Ask whether money changes hands
When a woman cooks and cleans for her own family, nobody pays her and nothing is sold. So this activity has no money flow.
Step 2: Link to the passage
The passage says that non-monetary exchanges are not accounted as part of economic activity. So work with no money flow belongs to this group.
Step 3: Test externalities
An externality is a side effect on someone outside the activity. Here the family members are the direct users of the service, not outsiders. So both externality options are out.
Step 4: Test GDP
GDP is a total measure, not a type of activity. Also, since this work is unpaid it is not counted in GDP. So option 1 does not describe it.
Step 5: Conclude
Only option 4 fits the idea of unpaid, unrecorded work.
Step 6: Why this matters for welfare
Because housework is not counted, GDP understates the real work done in an economy. The passage uses this as one of its three reasons why GDP alone is not a full index of welfare. This confirms that the right label for such work is non-monetary exchanges.
Final Answer:
Housework is an unrecorded, unpaid activity, so it is a non-monetary exchange. Option 4 is correct.
\[ \boxed{\text{Option 4}} \]