Today, the combined annual value of imports and exports from all nations is approximately:

The correct answer, which states that the combined annual value of imports and exports from all nations is approximately $20 trillion, reflects the staggering scale of global trade. This figure encompasses the total value of goods and services traded internationally, which has expanded significantly in the past few decades due to advancements in technology, logistics, and economic globalization.

Global trade plays a critical role in the interconnectedness of economies, allowing countries to specialize in production and benefit from comparative advantages. The rise of multinational corporations and e-commerce has further contributed to the increase in trade volumes, pushing the combined annual trade value into the trillions.

In contrast, the other values presented—$67 billion, $27 billion, and $67 trillion—are not reflective of the current landscape of global trade. The lower figures fail to account for the vast growth and significance of international trade in today's economy, while $67 trillion is overestimating the actual volume, as it is far beyond the current data trends observed. Thus, $20 trillion is the most accurate representation of the existing global import and export values.