help?

Which of the following statements is true? O All the statements are false. O All the statements are true. O Because it is not easily quantifiable, opportunity costs should typically be ignored when making decisions. O A firm that has few overhead costs but significant amounts of material and labor costs would likely find a flexible budget a useful performance measurement tool. E Company has developed the following standards for one of its products: Direct materials: 20 pounds at $4 per pound Direct labor: 5 hours at $18 per hour The following activities occurred during the month of October: Materials used: 180,000 pounds at $4.20 per pound Units produced: 10,000 units Direct labor: 51,000 hours at $17.70 per hour E's materials quantity variance would be: O $120,000 favorable O $80,000 favorable O $80,000 unfavorable O $120,000 unfavorable