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1.                            
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）

(E) in which two
persons develop a unique and private language with

why isn't A good? thanks