i think it would be C the reason for this is being that the definition of a quota is a limit on trade,and the question is asking for a way to limit it. an embargo limits all trade between a country, and a tariff raises the tax on trade and why would you want to decrease the safety standards? these are my reasons for it being : C. A quota on imports and exports
hope this helps
<span>The correct answer is Changing climates and nomadic enemies forced them to resort to alternative forms of sustenance. Shifts in climate force transitions in lifestyle. Invasions by nomads also compelled them to seek other ways of sustenance. As a result, they had to return to hunting and gathering at times. </span>
