Have you been to Rome --No,but that is the city ------.A whe

Have you been to Rome --No,but that is the city ______.A where
Have you been to Rome --No,but that is the city ______.A where I most like to visit B I would most like to visit.C which I like to visit most D where I would like most to visit.应该选哪个?为什么不能选其他三项?