The two events that led McVeigh to form a negative opinion of the US government and develop plans to bomb the federal building were the Waco and Ruby Ridge.
The third option is correct. The reason why McVeigh decided to bomb the the building was due to the negative motivation that he had about the United States.
He was angry about the way that the country had handled the Ruby Ridge incident and also the the Waco siege that had happened in the year 1993.
His claim on the reason he had to carry out the attack was that it was his revenge against the government for those two events.
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