I agree with Jimmy's approach. If the text was in a test, then I would be worried about the accuracy of the test because of the odd language. Nevertheless, the answer of the tester is correct in this case.
You are struggling with a tricky area of English grammar, which is the need to avoid dangling participles e.g. While laughing a lot at me, I was very upset. In my silly example, we don't know who was laughing.
However, in your sentence (Looking at it), there in an indirect object (it), which is clear. The sense of "look" is "consider". It's obvious from the whole context that it is a general point, and so the presumed subject is the general "we" "you" or "someone". Of course, this is a perfect context for a passive option too (when it is looked AT).