Correct option is B

From the given diagram we can find that person moves towards west then south and then east so from initial point we have
Distance from the starting point = √(2.5)2 + (2)2 = √6.25 + 4 = √10.25 =
3.2(approximately)
He is 3.2 km from the starting point.
Hence, "3.2 km" is the correct answer.