Answer:
Noise in the apartment house
Step-by-step explanation:
Costs are units or monetary value which are incurred/spent on taking a certain action. It is often quantitative in nature that is something that can be measured. Although noise is a factor which can affect Sandy's decision of moving from the apartment, it cannot be considered as a cost. Noise of the apartment is a qualitative factor. It does not have an intrinsic monetary value. Thus, in this regard it is an irrelevant cost for Sandy's decision to stay in the apartment or move to the house.
The other options have a monetary value and thus they are relevant for Sandy's decision.