Read the run-on sentence below
Puzzles are a lot of fun they require patience and strategy one strategy is to start with the edge pieces and then group pieces by color.
Which of the following best corrects it?
O Puzzles are a lot of fun. They require patience and strategy; one strategy is to start with the edge pieces and then group pieces by color.
O Puzzles are a lot of fun, they require patience and strategy, one strategy is to start with the edge pieces and then group pieces by color.
O Puzzles are a lot of fun, they require patience and strategy: one strategy is to start with the edge pieces and then group pieces by color.
O Puzzles, are a lot of fun; they require patience and strategy, one strategy is to start with the edge pieces and then group pleces by color

A properly breaks up the first two parts of the run on phrase. B and C do not, inserting a comma but the two independent clauses without anything to join them. D has an unnecessary comma after the first word, and a run-on sentence after the semicolon.