Explanation:

- Increase in population size: GDP at constant prices might show overall economic growth, but if the population grows rapidly, GDP per capita may not increase, potentially indicating stagnant or decreasing individual well-being.

- Change in working conditions: GDP doesn't account for qualitative factors like working conditions. Improved or worsened working environments can significantly affect social welfare but remain invisible in GDP figures.

- Composition of production: GDP measures total output but doesn't consider whether production is of beneficial goods. Increased production of harmful goods could lead to a higher GDP but lower welfare.

- All of these: Each of the above factors represents a limitation of GDP in measuring social welfare.