The answer to the following question is choice (d). Can you please let me know how to arrive to that answer. Thank you

25. Brinson-Hood-Beebower Calculations. You are conducting a return attribution analysis for a pension fund using the Brinson-Hood-Beebower framework. You received the following information from the pension fund about portfolio weights and performance for the previous year: Stocks Bonds Cash Policy (passive) weights: 40% 40% 20% Actual weights: 35% 30% 35% Passive (index) return: 7% 5% 4.5% Actual return: 6.5% 5.1% 4.5% How did active management affect portfolio performance in the previous year? (a) it reduced performance by 0.145% (b) it reduced performance by 0.160% (c) it reduced performance by 0.175% (d) it reduced performance by 0.320% (e) it improved performance by 0.145% (f) it improved performance by 0.160% (g) it improved performance by 0.175% (h) it improved performance by 0.320% (i) none of the above