When the votes were counted in 2005, Montana officials estimated they

Nice job, feruz77!

One other thing to add here - get used to seeing the word "that" as a separator between a verb and a new subject, like you have here:

Officials estimated THAT 200 additional apparatus would be needed

The GMAT will often include answer choices that incorrectly put a new subject (estimated they) or verb (estimated needing) right next to the dominant verb of the sentence. Here, we need the word "that" to separate the two clauses "officials estimated" and "additional apparatus would be needed".

Much like feruz mentioned about seeing pronouns in answer choices, the presence of the word "that" in some answer choices often leads you to a decision point, either when a spacer is needed as it was here, or in the case of:

"that of" (or "those of") when you may need to determine whether you need that pronoun for a comparison. e.g. "Google's engineering budget is twice THAT OF Microsoft" (not sure if that's true though). When "that" is present in some answer choices, look to see if you can make a decision as to whether it's required.