An Aeronautical Engineer Is Struggling with the Aerodynamics of a Prototype

An aeronautical engineer is struggling with the aerodynamics of a prototype aircraft and consults you for advice as to why his prototype struggles to stay airborne. His plane has a large aspect ratio and the angle of attack is 30 $\degree$ . Using your knowledge of flight, what would you advise the engineer?

A) Retain the aspect ratio, increase the angle of attack
B) Reduce the aspect ratio, retain the angle of attack
C) Reduce the aspect ratio, decrease the angle of attack
D) Reduce the aspect ratio, increase the angle of attack
E) Retain the aspect ratio, decrease the angle of attack