Examples, one with a comma and one without:
Shakespeare was born in Stratford and went on to write Hamlet.
Shakespeare was born in Stratford, later writing Hamlet
Mr . Thomas Putnam is mostly to blame
I believe the answer would be a.
It's B. The dashes separate a mild afterthought.
Answer:
1. Many honor St. Patrick every year on March 17. The limited historical evidence about St. Patrick has led to many creating versions of him to suit their own purposes.
2. Catholics and Protestants in Ireland have each created their own versions of St. Patrick.
3. The view of St. Patrick among Catholics is that he is exclusively a Catholic hero, while Protestants consider him an Irish hero.
4.. Most recently, Fox aired a made-for-TV movie that puts another twist into our ideas about St. Patrick.
5. In the 19th century, Irish immigrants in America used the St. Patrick's Day parade to show their political strength and numbers, an act of protest that continues to this day.