I came across this sentence in my japanese practicing material (the point is I didn't make up the sentence so I assume it's correct or at least commonly used)
and It doesn't make sense to me. What I guess the sentence means (out of the meaning of the used vocabulary) is something like: "according to a Japanese survey, the population of China has grown to 100 people". However I would phrase it as something along those lines:
I do not understand the gramatical structure of the sentence, nor I'm sure if I guessed the meaning correctly. How does を relate to the only verb appearing in the sentence (行く)?
This is the sentence as it appears in my exercise sheet (number 6) as a multiple choice exercise. Note that there are other possible choices rather than アンケート, but they make no sense to me at all: