please answer all and give me the correct answer with explanations. I will give a thumbs up

QUESTION 11 Which of the following is most often a relevant cost? O Fixed Cost O Sunk Cost O Variable Cost QUESTION 12 Qualitative (non-financial ) factors sometime over-ride the quantitative (financial) data O True False QUESTION 13 A special order should not be accepted if the sales price is less than the unit variable cost. O True O False QUESTION 14 A company should never accept an order for its product at less than its regular sales price O True O False QUESTION 15 Which of the following costs is not a relevant cost when it comes to decision making? O Variable costs O Fixed costs which changes Sunk costs QUESTION 16 Current trends in many organizations include less direct labor and more overhead/indirect cost O True False QUESTION 17 An opportunity cost is the potential benefit by using resources in an alternative course. O True False QUESTION 18 Which would be the most likely cost driver for the purchasing activity cost pool O Direct Labor Cost Purchase Orders Rent