Given line segment ab on line l, and a collinear point m, which must be true? a) m is on line l. b) m is between a and b c) m is on line segment ab d) m is the midpoint of a and b

Three or more points are said to be collinear if they lie on a single straight line.

Therefore, given that line segment AB is on line L, and a collinear point M, the statement that must be true is that "M is on lime L".