Can we draw the following hypothesis from the context (see options)?

Context:

The Big River, an inland perennial river of the Goulburn Broken catchment, part of the Murray-Darling basin, is located in the lower South Eastern Highlands bioregion and Northern Country/North Central regions of the Australian state of Victoria. The headwaters of the Big River rise on the northern slopes of the Yarra Ranges and descend to flow into the Goulburn River within Lake Eildon.

Hypothesis: headwaters of the Big River don't rise.
Pick your answer from:
[I] Yes;
[II] It's impossible to say;
[III] No;
[III]