Final answer:
Harmon Dobson died in a plane accident on April 2, 1967. He was the co-founder of Whataburger.
Thus, the correct option is A.
Step-by-step explanation:
Harmon Dobson died in a plane accident on April 2, 1967. He was the co-founder of Whataburger, a popular fast food chain in the United States. Dobson's death was a tragic loss for the company, but his legacy continues to thrive.
Therefore, the correct option is A) April 2, 1967.