Help with economics multiple choice?

Question

Why does the government collect aggregate economic statistics on the economy?

a) different firms go through the business cycle differently

b) aggregate statistics are less costly to compute

c) it is required by law

d) aggregate data are less prone to political bickering

Answer 1

C - required by law.

Answer 2

b) aggregate statistics are less costly to compute

I think gathering all data on microeconomics level just to know state of economy and it dynamics would be really too expensive process - so aggregates better solution.