Whish of the followng statements describes microeconomics?

The price of beef inmeased ty $15$ ro last mont due to a cyber attack on a major becf procerssing firm

inflation in Be bS increased ty $5\%$ in MJy $20?$

The fenieral povernment lowered corporate tax rates in $2019$

The sue of the U$.$S$.$ economy shis un: by Tot. in $2020$ due to the CoV$1$D crisis.