He said that he was young （ ） he couldn't carry the heavy box.A.and B.and that是不是应该选B呢,由and连接两个that宾语从句.

He said that he was young （ ） he couldn't carry the heavy box.A.and B.and that是不是应该选B呢,由and连接两个that宾语从句.
He said that he was young （ ） he couldn't carry the heavy box.
A.and B.and that
是不是应该选B呢,由and连接两个that宾语从句.

He said that he was young （ ） he couldn't carry the heavy box.A.and B.and that是不是应该选B呢,由and连接两个that宾语从句.
A
两个句子成分都完整 其实括号里写个逗号也是可以的
and这里是连词 没有标点 就用连词连接两个句子