The country of Brazil & Bolivia are the pair which share a border.
The border in this context refers countries which shares a close or immediate boundary. For instance, the nation of U.S. and Canada shares a border.
Here, the pairs including "Belgium & Bulgaria", "Belize & Barbados" and "Belarus & Bangladesh" does not share a boundary.
Hence, the country of Brazil & Bolivia are the pair which share a border.
Therefore, the Option B is correct.
Missing options includes <em>"a. belgium & bulgaria b. brazil & bolivia c. belize & barbados d. belarus & bangladesh."</em>
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3451 miles / 5555 kilometers / 2999 nautical miles.
Islam became part of North African cultures due to the geographical location and due to the spread of refugees from Saudi Arabia and other countries in Asia. North Africa was one of the first countries that Islam spread to other than Asia.