I'm sure you didn't mean the question to sound so confrontational, but it does come across that way.
I don;t think on the NHS you can 'opt' for a c-section. Maybe if you go private you can, and I know some celeb mums are ment to be opting for the 'mummy-tuck' (c-section and tummy tuck in one). But I'd say for your average women c-sections aren't seen as a choice, and they have to have them based on circumstances.
Apparently if you have one c-section, you can sometimes go on to have a normal delivery, but after 2 they have don;t give you a choice as the muscle has been cut too often and there is a chance of the wound re-openning.
In the UK C-sections account for about 25% of all births, but in Brazil that figuer is 80%. - A useless fact given at antenatal class.