Answer: Reminder
Explanation:
The reminder advertising is one of the type of marketing advertisement strategy that is used for reminding about the various types of products and the services in the market and this strategy is also used for introducing the new features and characteristics in the existing products.
The main objective of the reminder advertisement is that it basically using the promoting or the advertising strategy for targeting the customers or users about the goods and the services ion the market.
According to the given scenario, a chocolate manufacturer is basically using the reminder advertising during the Christmas. Therefore, reminder advertising is the correct answer.