Businesses have been using spreadsheets for years to keep track of data. lists of personal financial master

The correct answer is: “financial”.  

Therefore the complete sentence would be: "Businesses have been using spreadsheets for years to keep track of financial data."

Computer programs such as Excel allow people to create formulas, calculators, charts and an infinity of tools that assist and facilitate numeric information to be stored, also saving time and optimizing administrative tasks in an office or company.

they fear for their lives

ugly things like bugs or something?