prepare students for career/careers/their careers

[I'm a Chubby Baby]

Hi, everyone. Are all the three correct?

Universities don't prepare students for career/careers/their careers.

 

[Rover_KE]

Only the second and third are correct.

 

[I'm a Chubby Baby]

Thanks. I have a question. Why can't 'career' in my sentence in #1 be used uncountably whereas the quote below uses it uncountably?

Each accused the other of infidelity and of putting career before marriage. -Source: the New Yorker

 

[emsr2d2]

It uses "career before marriage" as a concept.