Final answer:
The correct answer is option c) They had a negative impact by highlighting social and economic issues.
Step-by-step explanation:
The Bonus Army protest and other demonstrations during Hoover's presidency had a negative impact on American morale. The protests highlighted social and economic issues that were affecting Americans during the Great Depression. The government's response to the Bonus Army, which was comprised of World War I veterans demanding early payment of their bonuses, ended in violence when President Hoover ordered the military to disperse the protesters, causing injuries and even death.
This harsh response, along with other economic hardships, led to a decline in public support for Hoover and revealed the severity of the nation's troubles to the public.