The usages of “来” and “去” (Elementary)

The right answer is

C

.

Translation:

Tom: Wǒ xiǎng qù Zhōngguó. Tom:我    想     去   中国。 Tom:I want to go to China. Li Hua: Tài hǎo le!  Nǐ shénme shíhou  lái Zhōngguó? Li Hua:太  好  了!你  什么        时候      来   中国? Li Hua:Great! When are you …