73 LR Two Question 9
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if you had taken the bearing minerals suffix out of both uses in E) would it have been right?
Ah. You're asking about Question 8 (you inadvertently posted your question under the Q 9 video, and you can imagine my confusion when comparing your question to Q 9 answer choice (E)).
But the answer is no; we don't know that there's any relation between the amount of sodium in the soil and the amount of flouride found there. We just know that there's more flouride in the water in places where there's more sodium in the water.
Note that this passage also would not support an answer that said that groundwater with sodium also contains flouride.
Imagine 100 groundwater reservoirs. In 40 of them, there's flouride. In 25 of them, there's sodium. Exactly five of those 25 sodium-containing reservoirs also contain flouride. In those five, the flouride concentration is 3%. In the other 35 flouride-containing reservoirs, the flouride concentration is just 0.5%. NOw, yo ucna see that sodium increases the concentration of flouride in the water, but it doesn't need to have any relation whatsoever to the presence of flouride in the water (after all , 20 out of 25 sodium reservoirs have no flouride at all!).