The correct answer is C. Absent from his duty and indiscipline.
A loco pilot is a railway employee who operates a locomotive. They are responsible for the safe and efficient operation of the train, and must follow all safety procedures. If a loco pilot leaves their duty place without informing their supervisor, they are considered to be absent from their duty. This is a serious offense, as it can put the safety of the train and its passengers at risk. In addition, it is also considered to be indiscipline, as it shows a lack of respect for authority and for the rules and regulations of the railway.
Option A is incorrect, as it does not take into account the fact that the loco pilot did not inform their supervisor. Option B is incorrect, as it does not take into account the fact that the loco pilot was absent from their duty. Option D is incorrect, as it is not a valid option.