Shortest way of solving such problems.?

The answers are-a,e,d,d,e,b,b,c.to solve such problems you have to draw a circle .think it as a table.then think rationally according to the given conditions and put the positions of the eight persons one by one.if you can think logically you'll get the right picture.then you can find the answers.the main thing is arranging them according to the given criteria.