"According to BCG's matrix, companies should invest carefully and closely monitor a , which is a product that has a small share of a growing market."

The correct answer is question mark.

Explanation:

Question mark products are also known as children's products. These products are positioned within the market with a lower growth rate than expected. Since growth is much lower than initially thought, the benefits are equally small. Companies that have one type of questioning product, are in need of making an investment after another in order to keep market shares at a healthy level always in order that these market shares are increasing with the passage of time until they no longer need extra money injections.