Which of these statements explains how Little Boy and Fat Man were delivered to Tinian Island?

A. Little Boy was delivered by a B-29 aircraft, while Fat Man was delivered by a submarine.
B. Part of Little Boy was delivered by a naval vessel, which was later attacked by a Japanese submarine, and Fat Man was delivered by ferryboat.
C. Fat Man was delivered by a B-29 aircraft, while Little Boy was delivered by a submarine.
D. Fat Man was delivered by a naval vessel, which was later attacked by a Japanese submarine, and part of Little Boy was delivered by ferryboat.