Below are four statements. Indicate which one pertains to macroeconomics.

Select one:

a. The profits of Metro rose after Covid-19 outbreak.

b. Bombardier entered into an agreement with Airbus SE and the Government of Quebec, under which Bombardier transferred its shares in the Airbus Canada Limited Partnership (ACLP) to Airbus and the Government of Quebec.

c. The US trade deficit with China increased $9.0 billion to $26.0 billion in April 2020.

d. General Motors plans to invest more than $20 billion in its next generation of all-electric and autonomous vehicles through 2025.