How do you know if it's counterfeit or not?

its actually more half art and half science question

depending on the item, some counterfeit is easier to spot, some is harder

do you have any item in mind? and perhaps take a photo so we can judget

Explanation:

i would say the answer is b. zigzag lines of the leaves. i believe this is the answer because zigzag lines go in different direction while the other options like: the vertical lines of the trees, the dotted lines on the road, and the curved lines of the park benches go in one direction.

answer; ravenna,italy;