medium · GMAT Verbal
A river's total sediment load reaching its delta depends on the volume of upstream water flow and the erosivity of the soils it passes through; higher flow volume alone, holding erosivity constant, always increases sediment load. Over the past twenty years, upstream flow volume in the Verrin River has increased steadily each year, yet the river's total sediment load reaching its delta has declined each year over that same period.
Which of the following can be most properly inferred from these statements?
- Soil erosivity along the Verrin River has not stayed constant over these twenty years.
- Upstream flow volume is not actually a genuine cause of higher sediment load in any river.
- Dam construction is the most likely explanation for the Verrin River's falling sediment load.
- The Verrin River's delta has been physically shrinking over the past two decades.
- Soil erosivity has decreased at a faster rate than the river's flow volume has increased.
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