The main reason for the increase in the number of households is generally considered to be the decrease in the size of households. Option C is the correct answer.
Families have been having fewer children on average, and there has been an increase in the number of single-person households, couples without children, and people living alone. These changes have led to a greater number of households overall.
While options A, B, D, and E may have some influence on specific cases or regions, they are not the primary reasons for the overall increase in the number of households.
Multiple home ownership (option A) is relatively uncommon, land costs (option B) can vary and may not necessarily lead to an increase in households, and mortgage rates (option D) can fluctuate but do not directly impact the number of households.
Option E, "None of the above," is also not the most accurate answer in this context, as the decrease in household size is widely recognized as a key factor.
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