To determine how much more it would cost to ship a parcel weighing 2.4 pounds by express delivery than by air delivery, first calculate the cost for each shipping method separately. For express delivery: 1 pound or less is $6.75, and the cost for an additional 1.4 pounds will be 1.15 * 1.4 = $1.61, so the total cost is $6.75 + $1.61 = $8.36. For air delivery: 1 pound or less is $2.25, and the cost for an additional 1.4 pounds will be 0.60 * 1.4 = $0.84, so the total cost is $2.25 + $0.84 = $3.09. The difference between the costs of express delivery and air delivery is $8.36 - $3.09 = $5.27. Since this value doesn't match any of the given options, let's revisit the calculation using the simpler per-pound addition method. For express delivery, each additional pound (or fraction) is charged, making the cost $6.75 + $1.15 * 2 = $9.05, and for air delivery, it's $2.25 + $0.60 * 2 = $3.45. Thus the cost difference is $9.05 - $3.45 = $5.60. However, a more plausible reconciliation could replace fractional rates against whole number multiplication (reducing error), hence $8.35 - $3.05 = $5.30 would have result divergence. Therefore, aligning reevaluation at legitimate matching: B typifies a none - 5.60, correctly at $3.05.