source: GMAT KAPLAN 800
Commercial Pilots receive their training from regional airlines with increasing frequency, often preferring to avoid the expense of the requirements of trainings offered by private companies and the service required by the Navy or Air Force.
A. ......
B. requirements offered for training by private companies
C. the training requirements of private companies
D. the training offered by private companies
E. private companies' training
Can someone please explain how I can tame such question; especially sentences that have syntactically correct options but differ in semantics - or intended meanings.
Thanks.