Answer: Choice C)
A straightedge can create a straight line, but can't measure. A ruler can create straight lines and measure distance.
===================================================
Step-by-step explanation:
A straight edge is anything straight you use to help draw straight lines. An example would be a piece of unmarked paper, or you can use a card perhaps. There are no markings on a straight edge to help measure distance. All you can do draw straight lines. A ruler is effectively a straightedge but with markings on it to help measure distance.