Final answer:
Before printing only the chart in a worksheet, you should move the chart to a new sheet, ensuring that no other worksheet data is printed along with it.
Step-by-step explanation:
When you want to print only the chart in a worksheet, the recommended action to take before printing is to move the chart to a new sheet. This can usually be accomplished by right-clicking on the chart to access the chart options and selecting 'Move Chart', followed by choosing 'New sheet'. This approach isolates the chart, ensuring that no other data on the worksheet will be printed. Other options, like adjusting the chart size or copying and pasting, might be secondary to the process, as adjusting might be needed for optimal printing results in the new sheet, and copying could be useful if transferring the chart to a different workbook.