Fill in the blank: In $2016,$ founder and CEO of Tesla Elon Musk attempted to change the direction of his company from a purely electric automobile company to one that also caters to clean energy generation and storage. In rebranding the company, Musk decided to change its from $"$to accelerate the world's transition to sustainable transport" to $"$to accelerate the world's transition to sustainable energy."

A$.$ Slogan

B$.$ Mission statement

C$.$ Vision statement

D$.$ Values statement