The correct option is B Map with the scale 10 cm = 6 km
For the map with the scale 10 cm = 6 km, 6 km distance in reality is shown in a 10 cm length. But for the map with the scale 1 cm = 6 km, 6 km distance in reality is shown in a 1 cm length, which will look smaller as 1 cm is smaller than 10 cm.
So the map with the scale 10 cm = 6 km will look bigger.