Best Answer Explained in Below-:

The length of the Great Wall of China is often cited as approximately 13,170 miles (21,196 kilometers) when including all the branches, trenches, and natural barriers that were part of its defensive system. However, if we refer to the most well-known sections that are frequently visited and recognized, the lengths mentioned in quiz options tend to simplify the matter.

Option C, claiming a length of 1500 miles, appears to be a misjudgment in overall context. In the realm of simplified education or in modern discussions around the wall, some might mistakenly refer to specific segments or popularized figures representing only parts of the wall, not accounting for its totality.

The true length substantially exceeds the options listed, emphasizing the need for precision in historical and architectural data. Thus, while C might be a chosen answer in a casual context, it is vital to recognize that it does not represent the comprehensive measurement of the Great Wall. The more accurate popular figures might range significantly but the actual length, as recently measured, provides a much larger interpretation of this monumental structure.