The correct answer is: A. F1
The F1 key is used to open the Help menu in most applications. In the context of selecting a company, pressing the F1 key will open the Help menu for the application you are using, which may provide instructions on how to select a company.
The F2 key is used to edit the text that is currently selected. In the context of selecting a company, pressing the F2 key would not be helpful, as you would not be able to edit the list of companies that are available to select.
The F6 key is used to move the cursor to the next field in a form. In the context of selecting a company, pressing the F6 key would not be helpful, as there is no form to fill out when selecting a company.
The F7 key is used to spell check the text that is currently selected. In the context of selecting a company, pressing the F7 key would not be helpful, as you would not be able to spell check the list of companies that are available to select.