Undefined notions in geometry are basic concepts that are accepted without definition and are used to define other concepts. In this context, the most appropriate choice for undefined notions would be Option #1: point, line, distance along a line, and distance around a circular arc.
This is because a point and a line are foundational concepts in geometry that are typically not defined explicitly. The distances mentioned can also be viewed as understood in the context of these undefined notions but may sometimes be defined based on context.
Thus, your answer is Option #1.