The correct options are
A The train passes through multiple longitudes.
B There exists no pre-determined standard time in the said country.
The local time of places which are on different meridians are bound to differ. It is, thus, difficult to prepare a time chart for trains which cross several longitudes. In India, for example, there will be a difference of about one hour and 45 minutes in the local times of Dwarka in Gujarat and Dibrugarh in Assam. It is, therefore, essential to adopt the local time of a central-lying meridian of the country as the standard time for the country.