Could you please help me choose the correct answer with explanations for question 1 and 2, question 3 is the explanation, thanks much.

Question 1: Macroeconomics is defined as a study of choice that focuses on (a) the decisions of households, firms, and governments aggregated across an economy (b) the decisions of individual households and individual firms and individual governments ( ) the decisions of investors in the stock market (d) the decisions of the World Trade Organization Question 2 : A decrease in the availability of beef cattle due to a mad cow disease will resultin (a) the supply curve for beef steaks shifting inward to the left and price increases (b) the supply curve for beef steaks shifting outward to the right and price decreases (_c) the supply curve for beef steaks shifting inward to the left and price decreases (d) the supply curve for beef steaks shifting outward to the right and price increases (e ) the supply curve for beef steaks does not shift and price remains the same Question 3 : How does the Consumer Budget Constraint Model compare to the Production Possibilities Frontier Model? Explain