Answer:
D) Excel Options dialog box
Step-by-step explanation:
To customize or configure the settings of the Excel application by hiding the worksheet gridlines and vertical scroll bar, Henry must have told her to make use of the "Excel Options Dialogue Box". It can be found at the "Excel Backstage View". To get here, she needs to click on "File" menu at the upoer left corner where the Excel icon is, then select options she desires to get her customisation done perfectly well.