Let us use a centimeter scale (on which only centimeter scales are there) to measure a length AB.

From the figure, we can see that length `AB` is more than `7 cm` and less than `8cm` . In this case, Least Count `(LC)` of this centimeter scale is 1 cm, as it can measure accurately, upto centimeters only. If we note down the length (l) of line AB as l = 7cm then maximum uncertainly or maximum possible error in l can be 1 cm(=LC), because this scale can measure accurately only upto 1cm.

Answer

A