337.Idioglossia is a phenomenon, incompletely understood at best, where two persons
develop a unique and private language with highly original vocabulary and syntax.
(A) where two persons develop a unique and private language with
(B) when two persons develop a unique and private language having
(C) in which two persons have unique and private language development with
(D) having two persons who develop a unique and private language that has
(E) in which two persons develop a unique and private language with
hi I have narrowed the choices down to A and E, however the only difference between them is the usage of "in which" vs "where". The correct answer is E, but I thought the usage of in which and where is interchangeable.
thanks in advance.
btw. I was a mgmat student.