The correct answer is the following: option A. Hopalong Cassidy was the famous TV cowboy star that was pictured on the decal of the lunch box. It was called the "Hoppy" and it was a red and white kit. The decal showed Hopalong Cassidy kneeling behind a mound of dirt, ready with a gun in each hand.
Hopalong Cassidy is a fictional cowboy hero created in 1904 by author Clarence E. Mulford who wrote a series of short stories and novels based on this main character.