Which sentence does not contain any punctuation errors? A. You stayed up late last night; hence, you are sleepy today. B. You stayed up late last night; hence you are sleepy today. C. You stayed up late last night hence, you are sleepy today. D. You stayed up late last night, hence you are sleepy today.
"A. You stayed up late last night; hence, you are sleepy today" since technically "hence" should start a new phrase and be followed by a comma. Although the comma is not absolutely crucial.