Does this sign prohibit continuing if you do not have snow chains?
A)Yes, in any case.
B)No, since this sign only recommends the use of chains.
C)Yes, unless you have other authorized devices that are equally effective.Correct
# Explanation
The snow chains sign is a **mandatory sign**, not just a recommendation. It prohibits continuing without chains, but this prohibition can also be met with **authorized alternative devices** that offer the same effectiveness, such as special winter tires or equivalent anti-skid systems. Therefore, you do not necessarily need chains, as long as you have another approved solution that guarantees the same level of safety.