this question is macroeconomics

Consider the following 4 economies with MPC out of disposable income (b), personal income tax rate (t) and marginal propensity to imports {m}. Which economy will have the highest simple multiplying effect? Economy; L i m A 0.8 0.1 0.15 B 0.8 0.1 0.20 C 0.9 0.2 0.10 D 0.9 0.2 0.15 O B O c Q A OD