Which of the following anthropogenic activities accounts for more than…

Concept — global freshwater use is accounted for by economic sector on two distinct measures. Withdrawal is the volume taken out of rivers, lakes and aquifers, part of which later returns to the source; consumption is the part that does not return, because it is evaporated, transpired, built into a product or otherwise removed from the basin. A use that passes water through a structure and releases essentially the same volume back into the same channel is an in-stream, non-consumptive use, so it registers as a sectoral share on neither measure.

Application — the stem asks which single sector exceeds two-thirds (about 67%) of global water consumption, so it is the consumptive column that settles the item. Global sectoral assessments give approximately:

Agriculture clears the two-thirds threshold on both measures — about 70% of global withdrawal and about 71% of global consumptive use, roughly 1,400 of 1,970 km³ per year — so the distinction between withdrawal and consumption does not change the answer. Irrigation supplies nearly all of it: crop evapotranspiration lifts the water into the atmosphere instead of returning it to the source, which is exactly why the consumptive share of this sector is even larger than its withdrawal share.

Cross-check — hydropower is absent from the table by definition, not by oversight. A run-of-river or reservoir plant spins turbines with the flow and discharges essentially the same volume downstream, so it is an in-stream non-consumptive use; only evaporation from a reservoir surface is a real loss attributable to it. The three sectors already sum to about 100% on each measure, which confirms that the split is complete without any hydropower entry.

Hence the anthropogenic activity responsible for more than two-thirds of global water consumption is agriculture.