Meganeura monyi is known for its wingspan measurement of which size?

• A. Wingspan of 2-3 feet
• B. Wingspan of 6 inches
• C. Wingspan of 4-5 feet
• D. Wingspan of 1 meter

Answer: (A)

Understanding how big extinct insects were often comes down to estimating from fossil wings and their body proportions. Meganeura monyi was a giant griffinfly from the Carboniferous, related to dragonflies but far larger. Based on fossil wing size and the way its wings would have carried the body, scientists estimate a wingspan on the order of roughly 65 to 70 centimeters, which is about 2 to 2.5 feet (some readings round this to about 2–3 feet in broader terms). That places it among the largest flying insects ever, but not as large as a meter or more.

So the option describing a wingspan of about two to three feet best matches the accepted size range for Meganeura monyi. The smaller option (around six inches) is far too small for this creature, and the larger options (four to five feet or about a meter) exceed the most supported estimates given fossil evidence and aerodynamic considerations for insects of that era.