Final answer:
Starbucks employs all four growth strategies: market penetration, market development, product development, and diversification to expand and sustain its global presence.
Step-by-step explanation:
Starbucks' overall marketing strategy is based on C. all four growth strategies. This includes market penetration, market development, product development, and diversification. Starbucks uses market penetration by opening more stores in existing markets and enhancing the Starbucks experience. Market development is seen in their expansion into new markets globally. Product development comes from their continuous innovation in creating new beverages and food items. Lastly, diversification is evident in their variety of product lines such as packaged coffee, merchandise, and even non-coffee products.