Final answer:
Tom Dobson was the chairman and CEO of Whataburger in 2005.
Step-by-step explanation:
The correct answer is A) Tom Dobson. Tom Dobson served as the chairman and CEO of Whataburger in 2005. He took over the role from his father Harmon Dobson, who was the co-founder of Whataburger. Under Tom Dobson's leadership, Whataburger continued to expand and grow as a popular fast-food chain in the United States.