One year ago, a municipality banned dishwasher detergents containing phosphates. Anecdotal evidence indicates that ma...

on September 9, 2019

Option D

I can see why C is correct but can someone please explain why D is incorrect? Thanks!

2 Replies

on September 17, 2019

Hello @Minerva,

Let's take a closer look at the last sentence:

Premise: Phosphate pollution from the municipal wastewater treatment plant decreased significantly in the last year.

Conclusion: Some residents did switch to phosphate-free detergent.

D is incorrect, because the percentage of total phosphate pollution that comes from the treatment plant is irrelevant. The author is only looking at one factor to draw the conclusion: the amount of phosphate pollution from the plant this year as compared to last year.

on November 30 at 03:25AM

But if there are waste water from some of the residents being treated at other plants, wouldn't that weaken the author's argument?