Need help answering this one please! thank you!

Choose the one alternative that best completes the statement or answers the question and explain your reasoning. Do not forget to include equations, graphs, or any other material to support your choice (answer); No credits without explanation. EHI'F PF Let the aggregate demand be described by the function D = D( PF , I, G, Y T, YF TF, Cg, g, yg). Assume the following functions for consumption, exports and imports: C=co+cl(YT) EX = [30 + [31(YF TF) + it] IMP = 70 + MY -T) - m where Cg, g, and yg are parameters (numbers) that can be positive or negative, and 01,131, y1,2, and 7/2 are parameters (numbers) greater than zero. Then, ALL of the following changes can shift the aggregate demand function DOWN in the Keynesian Cross diagram: a) a lower yg, lower g, lower Cg, lower T, lower G, lower I, and a lower EH/F' b) a higher yg, lower g, lower Cg, higher T, lower G, lower I, and a lower EH/F. c) a lower 710, higher g, higher Cg, lower T, higher G, higher I, and a higher EH/F. d) a lower yg, lower g, lower Cg, lower T, higher G, higher I, and a lower EMF. e) a higher yg, higher g, higher Cg, higher T, higher G, higher I, and a higher EH/F. Use a Keynesian cross diagram to support your answer. Explain why each of the changes shift the aggregate demand function down. No credit without explanation (you have to explain why each of the parameters included in the selected choice shift the aggregate demand down)