It depends on your personal preference. If you want to just be simplistic and use a phone for phone calls and stuff and that is it, then go with iphone. If you want a phone with more features, go with android. These are both smartphones. If you really want simple, then go with C or D.
No. If you make both denominators (aka the bottom number) the same, then you can see 3/4 is greater.
2/6=8/24
3/4=18/24