Identifying Macroeconomic Policy Steps:

• Define macroeconomic policy as government actions affecting the entire economy, like inflation, growth, and employment via fiscal or monetary tools.
• Assess each option: Macro policies target aggregates, not specific sectors or goods.
• Eliminate microeconomic options that focus on individual markets or industries.
• Select the option involving broad monetary control.

Why C is correct:

• Increasing the money supply is monetary policy, a core macroeconomic tool used by central banks to influence overall inflation, interest rates, and economic activity (per quantity theory of money: MV = PQ).

Why the others are wrong:

• A: Targets only the food industry, a microeconomic intervention in a specific sector.
• B: Addresses market structure for one firm, a microeconomic antitrust measure.
• D: Applies to a single commodity (wheat), a microeconomic price control.

Final answer: C