Final answer:
David Hogg led the impassioned plea for tougher gun control measures after the Parkland shooting, becoming a prominent advocate for change and organizing widespread demonstrations.
Step-by-step explanation:
After the mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, on February 14, 2018, which resulted in seventeen deaths, several survivors became vocal advocates for gun control. Among those who led the impassioned plea for tougher gun control measures was David Hogg. This activism sparked massive demonstrations across the country, including the notable March for Our Lives on March 24, 2018. David Hogg, along with other student survivors, utilized media appearances and organized protests to demand legislative action on gun control reform.