The mayor has been accused of taking a bribe based on the fact that a consultant that does business with the city paid for improvements to the mayor's vacation house. In his own defense, the mayor has said that he paid every bill for those improvements that was presented to him.
Which one of the following, if true, most undermines the mayor's defense?
Authorities are investigating the consultant for taking bribes from officials of other cities.
Irrelevant. We're not interested in whether the consultant took bribes, only in whether the mayor did.
The mayor was aware that many of the bills were being presented to the consultant rather than to the mayor.
This weakens the mayor's defense. If the mayor paid every bill presented to him, but also knew many bills were being presented to the consultant and not to him, his defense falls apart. It's clear he knew the consultant was paying for some of his home repairs, which makes it seem likely that he knowingly accepted a bribe.
The building contractor in charge of the improvements to the mayor's house had done business with the city in the past.
Irrelevant. This answer choice just brings in a third party, the building contractor. But whether or not this third-party contractor had done business with the city before doesn't change the fact that the consultant paid for the improvements, and doesn't tell us whether or not the mayor was aware that the consultant was doing so.
The improvements to the mayor's house were done with expensive materials and involved thousands of hours of labor.
The cost of the materials is irrelevant. This answer choice would just increase the size of the bribe, if the mayor did receive the improvements as a bribe. But whether or not he is guilty of accepting a bribe doesn't depend on the size of the bribe, but on whether he was aware the contractor was paying for the improvements. This answer choice doesn't help us determine that or undermine the mayor's defence.
The amount of money that the city paid the consultant over the last year greatly exceeded the cost of the improvements to the mayor's house.
Irrelevant. The amount the city paid the consultant last year and the costs of the mayor's home improvements have nothing to do with each other, as far as we know. This doesn't help us determine whether the mayor’s defence is valid.