A positive correlation has been found between the amount of soot in the atmosphere of cities and the frequency of a c...

Zahra on July 18, 2018

Question #19

I was stuck between A and B and picked A. can you explain this, please. Thank you

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Zahra on July 18, 2018

Sorry, this is supposed to be for question 19. I accidentally posted for question 17.

Mehran on July 20, 2018

@Zahra can you please repost your question to the correct board?

Thanks in advance!