Answer:
The correct answer is the second option: The girl wore a hat. It was covered with ribbons.
Step-by-step explanation:
A run-on sentence happens when two or more independent clauses (clauses that can stand alone as complete sentences) are joined in an incorrect way.
In the fragment given, there are two independent clauses:
- The girl wore a hat.
- It was covered with ribbons.
The best and simplest way to correct the run-on sentence is to separate the two clauses with a period.
There are other ways of correcting this mistake, like using a semicolon or a comma with a coordinating conjunction, but they depend on the context and style of the writing and are mostly used to show a specific relationship between the two ideas.