Which General participated in the Question Mark mission and demonstrated daylight bombing?

The involvement of General Ira C. Eaker in the Question Mark mission is significant because this operation was one of the early examples of sustained air operations in the United States Army Air Forces. The Question Mark mission took place in January 1929, where Eaker and his crew conducted a series of aerial refueling flights that lasted over a week. This mission showcased the potential for long-range strategic bombing and highlighted the capabilities of air power in military operations.

Eaker's role during this mission demonstrated the effectiveness of daylight bombing strategies and pushed the boundaries of how aircraft could be utilized in future military conflicts. His leadership and the success of the mission helped lay the groundwork for the development of long-range bomber tactics and strategies that would be employed during World War II.

The other figures listed, while notable generals with significant contributions to the U.S. military, were not associated with the Question Mark mission in the same capacity that Eaker was, making him the correct choice for this question.