Final answer:
Thomas Nast depicted Boss William Tweed as a vulture to symbolize the financial exploitation and corruption Tweed inflicted on New York City through graft and bribery. A is the correct answer.
Step-by-step explanation:
Cartoonist Thomas Nast portrayed Boss William Tweed as a vulture feeding on the city of New York because Tweed had cheated the city out of huge amounts of money.
Tweed, the leader of the Tammany Hall political machine, was known for his involvement in corrupt practices such as graft, bribery, and rigged elections, extorting over $200 million from New York City during the 1860s and 1870s.
Nast's cartoons were instrumental in raising public awareness about the corruption of Tammany Hall, contributing to Tweed's eventual arrest and imprisonment for his crimes.