这句句子如何改成并列复合句？题目：Tom had worked at the construction site all

这句句子如何改成并列复合句？
题目：Tom had worked at the construction site all day.He was too tired.He decided not to meet his friends at dinner. A：Because Tom had worked at the construction site all day,he was too tired,so he decided not to meet his friends at dinner. B：Tom had worked at the construction site all day.He was too tired,so he was too tired,and he decided not to meet his friends at dinner.