Jack Is Looking to Buy a New Computer and Asks

Jack is looking to buy a new computer and asks his friend Antonio, a software developer, for advice. Jack wants to know if the choice of operating system will impact the applications he uses or whether he can ignore this aspect and focus on the other specifications.
How should Antonio respond?

A) Different operating systems use different application programmer interfaces, so an application written for one operating system will not run on another operating system.
B) Operating systems are only an improvement to the user interface, and their use in computers is optional, so the choice of operating system is irrelevant.
C) Operating systems typically use the same application programmer interfaces (APIs) , so the same applications can be used across different operating systems.
D) Applications are written to directly communicate with hardware, so the choice of an operating system is irrelevant from the perspective of a non-developer.