I’m sorry if it’s wrong, but I’d believe the answer is... heel to toe.
Explanation: Because in my opinion that’s the only one that makes sense. Option 1 is wrong because when you walk to move forward your toes don’t hit the ground first, it’s the heel >>> leading into Option 2. And Option 3 and 4 also don’t make sense so I canceled them with process of elimination.
I hoped that helped