GMAT Sentence Correction (SC) | A decade after initiating the nation's most comprehensive

A clever question by the test maker knowing that students will be tired after AWA, IR, Quant and lots of passages and CR in verbal.
It is hard to read all the verbal diarrhoea in this question and it is also easy to get confused.
But the correct answer can be revealed in under 30 seconds
[color=#1b1464]We need a Noun that is being addressed to or modified by the starting phrase "A decade after initiating the nation's most comprehensive and aggressive antismoking program,===> NOUN /color]
Option
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