The marketing mix is a combination of various tools which would aid the sale of products to the target consumers. To achieve this goal, there are four P's of marketing that guide marketers and they are Place, Product, Price, Promotion. Place refers to all the activities that facilitate the distribution of the goods.
Inventory which entails having a list of goods in stock is necessary in the distribution process because, it would help the company to have a record or list of finished goods and raw materials needed for production so that they can have information on what is available and ready for distribution. This would also make purchasing convenient for customers.
A. The sentence works fine. one could argue B, but a colon is used to separate a run-on or show two complete thoughts in the same sentence, so arguably B would not work either.