Answer:(b) Only 3
Romania: It shares a border with Ukraine along its northeastern region. The border between the two countries stretches for several hundred kilometers.
Hungary: It shares a relatively short border with Ukraine in the northeast. The border between the two countries is located near the Zakarpattia region of Ukraine.
Slovakia: While Slovakia is not mentioned in the initial list, it is a neighboring country that also shares a border with Ukraine. The border between Slovakia and Ukraine is located in the far east of Slovakia, near the Carpathian Mountains.
Therefore, the correct answer is "Only three" countries share a land border with Ukraine.