Hmm C although I would argue they are substitutes goods unless we are looking at a brand as a factor as individuals will switch between on the basis of price.
They are both shoes so no change whatever one is cheaper all else equal is what consumers prefer till equilibrium between both preferences are reached so think it would be a mild change.
For second one looks like C since an inferior good is not a substitute unless their is a willingness it likely would be a forced decision based on income.
If the economy is doing bad then people will buy more cup noodles and kraft dinner over beef and ribs etc.
So D, C
Thanks for providing logic behind your answers.