a.They protested Congress's refusal for early payment of war bonuses.
Explanation:
The Bonus Army March was a demonstration of the hunger march of World War I veterans who met in the summer of 1932 during the Great Depression in Washington, DC, with the demand to pay their contractual military certificates ahead of schedule. The law of 1924 gave them the right to receive veteran pension payments (bonuses) for certificates issued to them when they reached old age (they could not receive payments until 1945). Each certificate issued to a qualified veteran soldier had a face value equal to 1 percent of the promised soldier reward, per day. The main requirement of the Bonus Army was the immediate payment of cash certificates.
