Sentence Correction (SC) | Re: In the mid-1970s, since birds were overcome by pollution, and routinel

Hello @rahulk2801!

You have presented a good analysis of the official sentence.

Here is my two cents on this official question.

(A) since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced:Incorrect

i. Presence ofand indicates the presence of a list. However, there is no entity beforeand that is parallel tofalling .
ii. Demonstrative pronounthis must be followed by a noun.