Arrange the following railway stations of the Trans Siberian Railway from west to east.
(A) Moscow
(B) Kazan
(C) Omsk
(D) Chita
Choose the correct answer from the options given below:

The correct answer is (A), (B), (C), (D).

To arrange the given railway stations of the Trans-Siberian Railway from west to east, we can trace their geographic locations along the route starting from European Russia and moving eastward across Siberia towards the Pacific Ocean:

1. Moscow (A): Located in westernmost Russia, Moscow is the capital city and serves as the starting point of the Trans-Siberian Railway. It is the westernmost station among the options.
2. Kazan (B): Located on the Volga River in European Russia, east of Moscow. The railway passes through Kazan after leaving Moscow as it travels eastward.
3. Omsk (C): Located in western Siberia, east of the Ural Mountains. As the railway crosses into the Asian part of Russia, Omsk is one of the major cities and stations encountered further east.
4. Chita (D): Located in eastern Siberia (specifically in the Transbaikal region), east of Lake Baikal. It is the easternmost station among the options listed.

Therefore, the correct west-to-east sequence is Moscow (A) → Kazan (B) → Omsk (C) → Chita (D), which corresponds to the order (A), (B), (C), (D).