哪条

which

→ 哪
phrase Uncommon #13,109
which 条 is a classifier used here for things such as legs, roads, and rules.
CH: 你想走哪条路?
EN: Which road do you want to take?

好几年以来,我一直在告诉别人哪条航线最合理。

For years, I’ve been telling people which route makes the most sense.

哪条

Which one?

— 地球上的星星 (2007)

你选哪条腿

Which leg do you choose?

— 摔跤吧!爸爸 (2016)

毕竟,我提前半年就告诉了人们自己要走哪条航线。

After all, I told people six months in advance which route I was going to take.