Correct answer: (c) Sochi
Explanation
- A
Kazan
Kazan is a major stop on the Trans-Siberian system (via the southern/main line through European Russia toward the Urals). It is on the route family, so not the ‘NOT located’ answer.
- B
Omsk
Omsk is a classic Trans-Siberian city in western Siberia. It is on the route.
- C
Sochi
Sochi is a Black Sea resort in the western Caucasus, far south of the Trans-Siberian alignment. It is NOT on that railway. That is why (c) is the official key.
- D
Chita
Chita is an important Trans-Siberian junction in eastern Siberia (toward Zabaykalsk/Manchuria and the Amur lines). It is on the system.
Summary. Official key is (c) Sochi. Kazan, Omsk and Chita lie on Trans-Siberian alignments; Sochi is a Black Sea city off that trunk.