The First Wawa Store Opened in 1964

The first Wawa store opened in 1964.Today the company has 15,000 employees and owns and operates more than 100 units in Eastern Canada.The chain's sales topped $2 billion in 2002.Wawa began as a store for distributing Wawa dairy products.Since then it has gotten into the gasoline business to increase store traffic,but its primary draw is hot meals and cold sandwiches in a quick-service restaurant format that mimics a shopping mall food court.Personalization is a fundamental part of the store concept and is built into things such as coffee and sandwiches.The stores have an eight-head cappuccino machine where customers can mix and match whatever flavours they want and add steamed milk or cream,all for the same price as a regular cup of coffee.In addition to being restaurants,Wawa stores also do a big business in a limited line of high-turnover convenience products and can accurately be described as mini-supermarkets.
-Refer to Wawa.What would the decision to allow customers to create their own coffee drinks be a part of?

A) Wawa's retailing mix
B) Wawa's promotion strategy
C) Wawa's production activities
D) Wawa's customer mix