It is given that area under the graph between two points , the area is Zero.
The function or the curve must be linear function , otherwise for any curve area can't be equal to Zero.
General equation of linear function is
y=mx+b
Because area occupied by a straight line is negligible that is equal to Zero.
So, if you take any two points on a straight line and calculate the area occupied between these two points , it will be equal to zero.
Answer=Any two points on the straight line or linear function.