Of these, only B is a macroeconomic issue. All of the others are primarily microeconomic issues.
Macroeconomics is the study of the economy as a whole. By contrast, microeconomics looks at decisions that are made by such entities as individuals, households, firms, or single industries. Using this definition, we can see that A, C, and D are microeconomic issues. A is a decision on the part of a firm, C on the part of a household, and D on the part of an individual.
By contrast, B looks at the whole economy. It looks at a decision taken by a government and examines its impact on all people in an economy.