D
that指代the price.
It is practically the same as that of a new motorcycle=It is practically the same as the price of a new motorcycle.事实上其价格与一种新摩托车的价格一样.
只有that有这种用法——放在of 前面作所有格,指代前文提到的另一样东西的所有格.又如：
The leg of my table is stronger than that of your table.我的桌子的腿比你的桌子的腿更结实.
The cover of your is more beautiful than that of mine.你的书皮比我的书皮漂亮.