Answer:
b
Explanation:
i do not know
BC?
天河安市瓦尔 地他同如何色却内侧 安定俄他
ExplanaIntroductory elements often require a comma, but not always. Use a comma in the following cases: After an introductory clause. After a long introductory prepositional phrase or more than one introductory prepositional phrase.tion:
