Correct option is A
Creep:
Creep is defined as the longitudinal movement of rail with respect to sleepers.
Rails have a tendency to gradually move in the direction of dominant traffic.
Remedial measures to prevent creep of rails
Pulling of anchors and anti-creepers should be done.
The number of sleepers per rail length should be increased.
Pulling back the rail to its original position.
One should provide adequate ballast and packing carefully.
For good grip, steel sleepers are used.