Going up an icy and steep hill, what is the best to use D3, D2, or just regular drive? (2001 honda civic)?

Going up an icy and steep hill, what is the best to use D3, D2, or just regular drive? (2001 honda civic)?

I think the d2 and d3 drives just raise the RPMs up. I would think the higher RPMs would help going up if you were hauling something heavy. I would keep it in regular drive.