A)"Whoa there, buddy," Leticia cautioned. "Let's not jump to any conclusions."

B)"Whoa there, buddy," Leticia cautioned, "Let's not jump to any conclusions."
C)"Whoa there, buddy." Leticia cautioned. "Let's not jump to any conclusions."
D)"Whoa there, buddy, Leticia cautioned, let's not jump to any conclusions."
E"Whoa there, buddy." Leticia cautioned, "let's not jump to any conclusions."

which ones right?

I'm pretty sure it would be A.

Ha, I'm sitting behind you! :D

A is not correct.

if a is wrong, then what would it b?

I think it's A.

http://grammar.ccc.commnet.edu/grammar/marks/quotation.htm

To determine which one is correct, we need to consider the rules of punctuation and dialogue formatting. In this case, we are dealing with a sentence that includes both dialogue and a dialogue tag, which is the phrase "Leticia cautioned."

According to standard punctuation rules, dialogue should be enclosed within quotation marks. Additionally, dialogue tags should be separated from the dialogue with a comma.

Option A: "Whoa there, buddy," Leticia cautioned. "Let's not jump to any conclusions."
This option correctly places the dialogue within quotation marks and separates the dialogue tag with a comma.

Option B: "Whoa there, buddy," Leticia cautioned, "Let's not jump to any conclusions."
This option also correctly places the dialogue within quotation marks, but it is missing a comma between the dialogue tag and the dialogue. The comma is necessary to separate the two parts.

Option C: "Whoa there, buddy." Leticia cautioned. "Let's not jump to any conclusions."
This option correctly places the dialogue within quotation marks, but it uses periods instead of commas to separate the dialogue and the dialogue tag. According to punctuation rules, commas should be used.

Option D: "Whoa there, buddy, Leticia cautioned, let's not jump to any conclusions."
This option is incorrect because it does not enclose the dialogue within quotation marks. Additionally, it is missing the necessary comma between the dialogue tag and the dialogue.

Option E: "Whoa there, buddy." Leticia cautioned, "let's not jump to any conclusions."
This option correctly places the dialogue within quotation marks, but it is missing a period at the end of the dialogue tag. According to punctuation rules, a period should be used to end the dialogue tag.

Based on the rules of punctuation and dialogue formatting, option A is correct:
"Whoa there, buddy," Leticia cautioned. "Let's not jump to any conclusions."