Which of the following is a run-on sentence?

Question

In 1783, the US Congress ratified a preliminary peace treaty, the US and Britain signed the Treaty of Paris, British troops left New York City, and George Washington resigned as commander.
On April 19, 1783, the US Congress ratified a preliminary peace treaty, and the Treaty of Paris followed about five months later.
On September 3, 1783, the US and Britain signed the Treaty of Paris, and two months later, British troops left New York City.
On April 19, 1783, the US Congress ratified a preliminary peace treaty and five months later, the US and Britain signed the Treaty of Paris and British troops left New York City in November.

Answer 1

The sentence that is a run-on is:

"On April 19, 1783, the US Congress ratified a preliminary peace treaty and five months later, the US and Britain signed the Treaty of Paris and British troops left New York City in November."

This sentence combines multiple independent clauses without appropriate punctuation or conjunctions, resulting in a run-on structure. It could be improved by breaking it into separate sentences or using appropriate conjunctions and punctuation to clarify the relationships between the clauses.