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?