According to the Gurney-Mott Theory of Image Formation

According to the Gurney-Mott theory of image formation,

A) at least three silver atoms must form a visible black metallic silver speck upon processing.
B) several thousand atoms must form a visible black metallic silver speck upon processing.
C) the process begins with an electron migrating toward the x-ray photon.
D) positively-charged sensitivity specks are formed by the migration of photons.