What datatype is best-suited to hold the values of the names of the months when using a "For Each" activity?

Using an array of strings is the most suitable choice for holding the values of the names of the months when utilizing a "For Each" activity. An array of strings efficiently stores a fixed number of elements, in this case, the twelve names of the months, allowing easy iteration through each month using the "For Each" activity.

Arrays provide constant-time access to their elements, which is beneficial for performance when looping through the items. This structure aligns perfectly with situations where you know the exact number of items to handle in advance, which in this case is the twelve months. It allows the program to easily loop through these names and apply any operations needed for each month without the need for additional overhead.

In contrast, a list could be a viable alternative but may introduce extra complexity if the size is fixed and known. A dictionary is not appropriate here because it is designed to store key-value pairs rather than a simple list of items like month names. Lastly, an array of integers is not relevant for this context, as months are represented by strings and do not need numeric representations. Hence, the array of strings is the best fit for this scenario.