Which sentence is punctuated correctly? A.
There were only three questions left when the teacher said "Okay, pencils down."
B.
There were only three questions left when the teacher said, "Okay, pencils down."
C.
There were only three questions left when the teacher said "Okay pencils down".
D.
There were only three questions left when the teacher said, "Okay pencils down".

B is the correct one

Explanation:

There is a comma before said, used opening quotation marks, capitalized okay following with a comma, and has a period then end quotation marks.

B.

There were only three questions left when the teacher said, "Okay, pencils down."

Explanation:

The correct answer should have quotation marks around what the teacher said. To introduce the quote, a comma should be before the opening quotation mark. A comma also belongs after the introductory word inside of the quote ("Okay"). A period that ends the sentence should always go inside of the quotation marks.

can you provide the possible answers

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.