Which sentence is punctuated correctly?

A. One of only two in existence today, this manuscript rarely leaves the museum's vault.

B. One of only two in existence today this manuscript rarely leaves, the museum's vault.

C. One, of only two in existence today, this manuscript, rarely leaves the museum's vault.

D. One of only two, in existence today, this manuscript, rarely leaves the museum's vault.

anyone know the answer? my answer was b.

I see the correct one. Why do you think it's B?

Basic comma rules of usage:

http://grammar.ccc.commnet.edu/grammar/commas.htm

because that's telling the reader that the manuscript is in the museum's vault.

I changed my answer to c.

What is the MAIN CLAUSE in the sentence?

http://www.chompchomp.com/terms/mainclause.htm

The correct sentence based on proper punctuation is A. "One of only two in existence today, this manuscript rarely leaves the museum's vault."

To determine the correct answer, it helps to understand punctuation rules. In this case, the sentence includes a descriptive phrase ("One of only two in existence today") that provides additional information about the subject ("this manuscript"). When such a phrase is included in a sentence, it should be set off by commas.

Let's analyze each option to determine which one follows the punctuation rules:

A. "One of only two in existence today, this manuscript rarely leaves the museum's vault." - This option correctly uses commas to set off the descriptive phrase.

B. "One of only two in existence today this manuscript rarely leaves, the museum's vault." - This option lacks a comma before "this manuscript" to properly separate the descriptive phrase.

C. "One, of only two in existence today, this manuscript, rarely leaves the museum's vault." - This option uses unnecessary commas, resulting in incorrect punctuation.

D. "One of only two, in existence today, this manuscript, rarely leaves the museum's vault." - This option uses unnecessary commas, resulting in incorrect punctuation.

Therefore, the correct answer is A, not B.

Nope, that's two wrong guesses. Please don't post about this again.

Do read over those comma rules, though. You should be able to figure it out from that.