Q.The rules may require 1,000 or more makers of drugs,

When grammar is not part of a decisive split, logic takes over. The crux of the matter is to arrive what will be starting late next year? Is it the launch of the website or the posting on it or the easy searchability? Launching it now and waiting until late next year either for posting or for easy searching may not make logic. But, A says the website will be easily searchable early next year. Therefore, it is difficult to digest that A, B, C or E could be the intended choice. However, D obviates this doubt by creating a comma +verb+ing modifier, thereby rendering it to modify the nearest previous clause whose subject is the government and its action namely posting. If I have to, I 'll put my two cents on D.