The correct option is C 75
We know that,
1 m = 100 cm
1-meter long ribbon measures 100 cm.
As the ribbon is cut into four equal parts, each part will measure quarter of the whole.
Measure of one part
= Quarter of 1 m
= Quarter of 100 cm
= 100 ÷ 4
= 25 cm
Therefore three parts will measure
= 3 x (measure of one part)
= 3 x (25)
=75 cm