The correct option is
A Take his Maths Project File
A. Take his Maths Project File is correct as Abhi told Namita to inform Varsha to bring his Maths Project File as he had to submit it to the teacher the following day. It means Varsha is supposed to take his file to school.
The other options are wrong as 'to' denotes direction and for denotes reason. So, the two can't come next to each other. The reason Abhi called Varsha was not solely to tell her about attending the class or submitting the file.