Final answer:
The best option for pasting a chart when the data is unlikely to change is to paste it as a picture. This method ensures that the chart does not update with any changes to the original data source.
Step-by-step explanation:
When it is unlikely that your data will change, the best option for pasting a chart is D. Paste as a picture. This method ensures that the chart remains static and is not affected by any changes in the source data. Pasting as a linked chart (A) would create a link to the original data, which means the chart could change if the source data changes. Option B, pasting as Excel source data, maintains the data connection, which is not necessary if the data won't change. Embedding the source data (C) keeps a copy of the data within the document but can increase file size and also allows for the possibility of the chart being inadvertently updated if the embedded data is edited.