Please tell me answer. Of first Question

Dear student,
Please find below the answer:

The conventional current is the flow of positive charge through a conductor. But in actual, electric current is the flow of electrons which is negatively charged. 
 
In this case, when you have to choose an option, then it would be (b) i.e. electric current is the flow of positively charged particles.

Hope this clears your doubt.
Regards.