Based on geographical analysis, the pair of B countries that share a border is "<u>Brazil and Bolivia</u>."
<h3>Where are Brazil and Bolivia?</h3>
Both Brazil and Bolivia are located in South America continent.
Bolivia is located in the west of Brazil.
Brazil is surrounded by countries like Paraguay, Uruguay, Peru, Bolivia, Colombia, Venezuela, among others.
Hence, in this case, it is concluded that the correct answer is option B. Brazil and Bolivia.
Learn more about geographical location here: brainly.com/question/12790602
