Signs warn you of hazards, like sharp curves and dips in the road

a. regulatory
b. warning
c. guide
d. construction

Option B

Explanation: The signs that warn you of hazards are called warnings, you will find them in a lot of places, for example, inflammable things, toxic things, explosive things, etc.

Especially if you work with these type of things, is obligatory that you can identify the type of Hazzard and take the necessary measures before starting to work with it.

Then to right option is B.