Choose the right answer from the four alternatives given below.

Which country has the highest density of railway network?

Option (B) is correct because U.S.A has the highest density of railway network. It has about 250,000km of railway network.

Option (A) is not correct because Brazil has about 28,000km railway network.

Option (C) is not correct because Canada has about 48,000km railway network.

Option (D) is not correct because Russia has about 85,500km railway network.