Option 1 -> Incorrectly matches Cryptography with Oceans and misaligns all other terms.
Option 2 -> Correctly matches: Cryptography with secret writing (III), Oceanography with oceans (I), Orthography with correct spelling (II), and Orography with mountains (IV).
Option 3 -> Incorrectly matches Cryptography with spelling and completely misaligns all definitions.
Option 4 -> Incorrectly matches Cryptography with mountains and misaligns other pairings.
Hence, Option 2 -> Cryptography is the study of encryption and coded messages; Oceanography is the scientific study of oceans; Orthography relates to conventional spelling systems; and Orography is the branch of physical geography dealing with mountains and their formation -> correct