What is the primary purpose of a mission statement?

A. To state the reason for the existence of a business
B. To explore the options for a business
C. To list the immediate goals of the business
D. To promote the growth of a business


In case here what I read but I'm having trouble : Take your time in coming up with your own mission statement. When you create a strong mission statement, it serves as a beacon to guide your company toward your goals. It can keep you directed toward your primary purpose no matter what kind of changes you encounter—distractions, setbacks, new opportunities, expansion, diversification, and more.