Scenario 2. Pens sell for $5 each and markers sell for $3 each. Aaron's total utility for various quantities of cach good is given below. His budget is $60. PENS MARKERS Quantity TU Quantity TU 0 0 0 0 39 5 10 69 10 40 90 15 60 105 20 64 12. Refer to Scenario 2. What combination of pens and markers will maximize Aaron's total utility given his budget? a. 6 pens, 10 markers c. 9 pens, 15 markers b. 9 pens, 5 markers d. 3 pens, 15 markers 13. Refer to Scenario 2. The marginal rate of substitution at the optimal consumption bundle is: a. 2.00 C. 1.67 b. 1.75 d. 1.33