The correct options are
B January is the coldest month of the winter season.
C There is winter rainfall observed due to the moisture picked up from the Central Sea.
The temperature is low in almost all the regions of Gujarat between the months of December and February. Minimum temperature is experienced during the winter season in January. Cold and stormy winds blow from the Central Sea over Gujarat due to which some parts of the state experience a little bit of rainfall called 'mavthu’, that means 'shower' in Gujarati.