The answer to your question would be that the option that stands for example of a run-on sentence would be the following one: 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 is a case of a comma splice. A comma splice occurs when two or more independent clauses are joined wtih just a comma. Take the example,
1) The US Congress ratified a preliminary peace treaty and five months later,
2) The US and Britain signed the Treaty of Paris and British troops left New York City in November.
