What would be the best exercise machine purchase out of these 5 options?

the best way if you want to build up your muscles to go for the rowing machine because i do rowing and i find that it is easier to build up your muscles...! i have been rowing for 3 years and believe me it works. if you go for a bike thingy then that would work but tuck your stomache in and breathe in aswell to help you get better results... good luck