Point is undefined term among all the given options.

Step-by-step explanation:

The undefined terms are those which can not be defined.

So, we will consider all the four options given

Option A:

Point is an undefined term because it can not be defined it can be drawn anywhere.

Hence, option A is correct.

Option B:

segment join two points hence, it is defined between those two pints.

Hence, Option B is not correct.

Option C:

plane is a straight line between two points hence, it is defined between two points

Hence, option C is incorrect.

Option D:

Angle is measure between two lines that are intersecting  or between two surfaces hence, defined

Hence, Option D is not correct.