Final answer:
b) For structural stability. The aircraft seam requires 25 rivets for structural stability.
Step-by-step explanation:
The subject of this question is Engineering. The question is asking why an aircraft seam requires 25 rivets. The correct answer is b) For structural stability. Rivets are used in aircraft seams to hold the parts of the aircraft together and provide structural support. They prevent the aircraft from coming apart during flight and ensure its stability. Rivets are not used for other reasons such as preventing corrosion, enhancing aerodynamics, or as a decorative element.