The correct answer is A) Seasonality.
A Boston Hallmark store is preparing a budget for the next year and needs to forecast sales. The store notices variation in sales around holidays. The pattern that describes the data to be forecasted is "Seasonality."
This sales term means that during a specific season, the volume of sales increases due to the high demand on the part of the consumers. In this case, when Christmas comes, the Boston store has data that proves that there is a considerable positive variation during the Christmas season and that is why this variation must be included in the budget and the forecasting of sales in that season.