Which one of the following countries does not have border with Lithuania?

The correct answer is option 2 (Ukraine). Lithuania is one of the three Baltic states and shares land borders with Latvia to the north, Belarus to the east/southeast, and Poland to the south (and also borders the Russian exclave of Kaliningrad to the southwest); it does not share a frontier with Ukraine. Political maps clearly show Lithuania’s immediate neighbours as Poland, Belarus and Latvia, but not Ukraine [1]. The description of the Belarus–Poland border refers to a northern triple junction with Lithuania and a southern stretch to Ukraine, which confirms Belarus borders both Lithuania and Ukraine while Lithuania itself does not reach Ukraine [2]. Baltic-state overviews likewise list Lithuania’s adjacent countries without including Ukraine [3].

Sources

1. [1] https://www.nationsonline.org/oneworld/map/lithuania-map.htm
2. [2] https://en.wikipedia.org/wiki/Belarus%E2%80%93Poland_border
3. [3] https://www.britannica.com/place/Baltic-states