The correct option is C To gain necessary centrifugal force
A cyclist moving in circular track leans towards the center because ifhe
keeps himself upright then it will result in skidding because the only
centripetal force would be the frictional force because mg and N would
cancel each other, is since their velocity is quite high so it is
dangerous to rely upon only frictional force i.e they need some other
centripetal force .While bending a component of N also provides the
centripetal force .Thus he can take a turn .