(B) Bolivia — Federal
Bolivia practices a federal system of government, making this the correctly matched pair.
Canada, Australia, and Spain are not federal systems in the simple sense used here — Canada and Australia are federal, but the options list them as "Unitary," making those pairs incorrect. Bolivia is explicitly mentioned in the NCERT textbook (Ch. 2) as an example of a federal country. Examiners expect direct recall of which countries follow federal vs. unitary systems as given in the textbook.