You will be given a definition of a task first, then some input of the task.
In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to lock cells in excel [title] Open the excel spreadsheet that contains the cells you want locked. [title] Select the cell or cells you want locked. [title] Right-click on the cells, and select " format cells. <sep> (A) [step] " [title] Click on the tab labeled " protection. [step] " [title] Place a checkmark in the box next to the option labeled " locked. (B) [title] Drag cell b1 into cell b2, then c : [step] ...., and drag cells d: , t: , and g: : ,. [title] Right-click the cell in cell b2, and select format cells. (C) [step] " complete the format process as previously outlined in the file tray. [title] Right-click on the cell in view. (D) [title] Click on the " format cells " link below the cells you want to lock. [step] You can also right-click on the image of a formula or a cell to close the cell.
Output:
A