Answer:
Segment, line and Ray
Explanation:
Lets discuss all the options one by one.
Point:
A point has no length, no width and no depth. It is 0 dimensional.
Line:
A line extends in both directions. It is straight and has no thickness. It is 1 dimensional
Segment:
It is a part of a line bounded by two distinct end points. As it is a part of a line than it is also 1 dimensional.
Triangle:
A triangle has three sides and three corners. It is two dimensional figure. Its interior or oval is also two dimensional.
Plane:
A plane is a two dimensional flat surface with no thickness.
Ray:
A ray is a part of a line with single end point. It goes off in a particular direction infinitely. As it is a part of a line hence it is also 1 dimensional:
Thus according to the above description Segment, Line and Ray are one dimensional