The characteristic that best represents good walking technique is letting your arms swing loosely and your feet so they move fluidly and finding great balance so you last longer. So the best answer to your question is letter D. I hope this helps.
Among the characteristics and recomendations that doctors give to people for proper walking are the fact that they have to touch the grounf with their heels first, then they should look straigh ahead, roll through the ground from heel to toe and leave their arms swing loosely, so the only option from the options given by the question would be D.
I think the first and important one would be to be an example yourself in your relationship and I think equal power relations also talking to them about it also does promote equal power relations
