Final answer:
Dickens's use of vivid descriptions of child labor and the grim setting of industrial London in his works support the theme of society failing to care for orphans and other vulnerable groups during the Industrial Revolution.
Step-by-step explanation:
The events in Charles Dickens's works that most strongly develop the theme of society's failure to care for orphans are those highlighting the harsh realities faced by children in Industrial Revolution England. Notably, Dickens's descriptions of child labor, long work hours without sufficient welfare measures, and the grim environment of London overrun by the filth of industrialization contribute to this theme. For instance, in 'The Pickwick Papers,' the use of sentence fragments to describe a destitute experience, the depiction of London's streets in his famous first sentence, and the broader social critique in 'Hard Times' with the setting of Coketown, all exemplify the plight of the vulnerable, especially children, amidst a society preoccupied with economic gains over human welfare.