Final answer:
Fixed costs should be ignored in trade-off decisions if they prevent you from getting more of what you want. The correct option is: 1) Fixed costs.
Step-by-step explanation:
In trade-off decisions, the factor that should be ignored if it prevents you from getting more of what you want is fixed costs. Fixed costs are sunk costs that have already been spent and cannot be recovered. Therefore, they should not be considered in making current decisions. On the other hand, variable costs, opportunity costs, and marginal costs are all factors that can be changed or adjusted to achieve desired outcomes.