For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to
non-uniform distribution of requests
arm starting and stopping inertia
higher capacity of tracks on the periphery of the platter
use of unfair arm scheduling policies
According to wiki: http://en.wikipedia.org/wiki/Hard_disk_drive_performance_characteristics#Seek_time
answer should be (B).
Why not use of unfair arm scheduling policies
What if SCAN or LOOK algorithms are used?
The answer cannot be B, latency used by itself is used to refer to rotational latency and not seek time. Even then I find no other option to be suitable.