Hartzell Inc. had the following data for $2020,$ in millions: Net income $=$$$600$; after$-$tax operating income EBIT$(1-$ T$)]=$ $$700$; and Total assets $=$$$2,000.$ Information for $2021$ is as follows: Net incor $=$$$825$; after$-$tax operating income $[EBIT(1-T)]=$$$1,150$; and Total assets $=$$$2,450.$ Assume the firr had no excess cash. How much free cash flow did the firm generate during $2021?$

a$.$ $$700$ million

b$.$ $$925$ million

c$.$ $$1,275$ million

d$.$ $$1,600$ million

e$.$ $$375$ million