The answer in this scenario is regulation (Answer B).
Education results in a more skilled and productive work force, technological advancement improves efficiency and therefore productivity, and trade promotes increases in productivity.
Regulation, while necessary in many industries, is a form of restriction. This often means it drives up the cost in providing goods and services which dampens productivity. It's important to note that regulation is a very important tool to protect certain aspects or parties within an industry. For example, regulation is often in place to limit the maximum price that consumers (like you) can be charged for essential services like energy, water and sewerage.
C. Ranchers wanted to get their cattles to the east
It seems that you have missed the given options for this question which are the following: a) the increase in religious-based sex-abstinence programs
b) the availability and use of effective contraceptives
c) the decrease in the number of people getting married
<span> d) an increase in same-sex couplings
Based on this, the reason that is most likely why the dramatic decrease in the number of children in the average American family is the </span>the availability and use of effective contraceptives.
