PREP一道,請大家幫忙一下

(1)  On the number line, the distance from 3 to n is of the distance from 3 to 9.

(2)  On the number line, n is 10 units to the right of -3

【答案】D

我想問的是2選項,unit 不能確定剛好就是1個單位吧...也可能是0.5 為一個unit啊

請大家幫忙一下~~謝謝