I was writing a question on Security.SE and couldn't figure out which pronoun was actually correct in the sentence:
This [process] always ends with/in a phone call.
The intended meaning is that because of certain policies, the end result of a process is a phone call (to me).
Which preposition is correct here, and why? If they are interchangeable, why?
PS - I'm asking on ELL.SE because I would like to know how to explain this to my French ELL students in the future. Prepositions are notoriously difficult to explain...