The creation of sails is generally credited to ancient civilizations, primarily Egypt, as they are known to have developed sails for use on the Nile River. However, Mesopotamia also contributed to advancements in sailing technology. Therefore, if you are choosing based on the options provided, "Both" could also be considered correct, as both civilizations played significant roles in the development of sailing.
To select the most direct answer based on historical credit, "Egypt" is often recognized for its early innovations in sailing. However, the answer may depend on the context of the chart in question and how strictly it interprets contributions from each civilization. If the options allow for a more comprehensive view, "Both" could be appropriate as well.