Which of the shapes cannot be traced without lifting up your pencil and without tracing over the same edge twice?
+310 First off, just by glancing at the shapes, we can tell that C is different.
A, B, and D's lines are all straight, while C has four curved lines.
So we can reasonably guess that C is the correct choice.
However, you can also test it out. It becomes obvious after a few trials that no matter what you do, it's impossible not to retrace the same edge.
