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

In the mid-1970’s,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 automobile emissions.

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

(B)since birds that had been overcome by pollution were routinely falling from the sky above Los Angelesfreeways, it