To determine which statement best summarizes the information on the chart, we can analyze the content of each option in relation to trade patterns between the U.S., Canada, and Mexico:
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Canada and Mexico imported more from the U.S. than they exported - This statement may or may not be true based on the chart, but it does not necessarily summarize the overall trends.
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Over the 20 years shown, NAFTA greatly increased trade - If the chart shows a significant increase in trade levels following the implementation of NAFTA, this could be a valid summary.
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The United States exported more to Canada and Mexico than it imported - This statement could summarize overall trends if the chart indicates a larger volume of exports from the U.S. to those countries.
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The trade levels varied up and down over the 20 years shown - This indicates fluctuations but does not offer a clear summary of the overall trend or impact.
If the chart demonstrates a clear upward trend in trade volumes due to NAFTA, option 2 would be the best choice. However, without seeing the chart, the choice would largely depend on the specific data it presents. Based on common trends associated with NAFTA, "Over the 20 years shown, NAFTA greatly increased trade" is likely the best summary if the data supports it.