You don't need to go any---.The post office is near,here.

很高兴为你解答.
保证正确率~!

正确答案是：B

【解析】：
You don't need to go any【 farther】.The post office is near,here.
你不需要再走了,邮局很近,就在这里.

farther 是far 的比较级,符合题意,而far 是远,farthest 是最远,均不符题意.

祝开心~!