see I think this is the reason why your visa was refused. If you think your application needs extra explaining that I'd strongly recommend you to write a SOP. It's written to assure VO that you'll return back home and the program is beneficial to your future employment chances in YOUR OWN country. Never write that you want to work / settle in Canada when you are applying for student visa. I'd advice you to bookmark this website. This forum will provide you the best free advice you can get!