Final answer:
The run-on sentence is 'Roll the chilled dough into small balls and place them on a greased cookie sheet use a floured fork to press them flat and then bake for 10 minutes.' It can be corrected by adding a semicolon or a conjunction and a comma to properly separate the independent clauses.
Step-by-step explanation:
The sentence that represents a run-on sentence is: 'Roll the chilled dough into small balls and place them on a greased cookie sheet use a floured fork to press them flat and then bake for 10 minutes.' This sentence is considered a run-on because it consists of two independent clauses joined without appropriate punctuation or a coordinating conjunction.
To correct this run-on sentence, you could use a period, a semicolon, or add a conjunction such as 'and': 'Roll the chilled dough into small balls and place them on a greased cookie sheet; use a floured fork to press them flat, and then bake for 10 minutes.' Now, each idea is correctly separated, making the sentence clearer and grammatically correct.