The correct option is B 125 mm
One meter equals to 100 cm.
There are 7 points marked on the given one-meter scale which means there are 8 equal segments.
The value of each segment will be:
1 m8
=100 cm8
=12.5 cm
Since, 1 cm = 10 mm
So, 12.5 cm = 125 mm
Thus, the length of each segment is 125 mm.