Nandini goes 3 km towards South from her office. She now turns towards West and goes 8 km. She takes a left turn and goes 4 km. She further takes a right turn and goes 8 km. Now she takes a right turn and goes 4 km. She takes two left turns and goes 8 km and 4 km respectively and reaches Bank. What is the shortest distance between her office and Bank?
A21 km
B23 km
C25 km
D24 km