Which attack involves performing an action and eliminating evidence that could prove the identity of the attacker?

What happened in the 2000 election of al gore vs bush

Because of the housing bubble, many houses are now selling for much less than their selling price just two to three years ago. there is evidence that homeowners with virtually identical houses tend to ask for more if they paid more for the house. what fallacy are they making?

Describe some effects of the rise of communism in the soviet union?