What Will Toddlers Usually Do When Confronted with a Steep

What will toddlers usually do when confronted with a steep slope while walking?

A) They will adamantly refuse to go down it.
B) They will usually stop and crawl down the slope.
C) They CANNOT go down any slopes until approximately age 2.
D) They CANNOT tell the difference and will try to walk down it, usually resulting in their falling down.