What’s the worlds largest plane

Antonov An-225

Explanation:

Generally acknowledged as the largest airplane in the world, the single Antonov An-225 is the world's heaviest aircraft ever (maximum takeoff weight greater than 640 tons) and the largest heavier-than-air aircraft (in length) ever entering operational service.

b. failure at least that one seems the most negative out of all of the answers provided pls correct me if i'm wrong. : ))

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.