punctuation - How to punctuate a quote within a quote?

Duplicate of:
What’s the difference between using single and double quotation marks/inverted commas?
How are embedded quotations used?
And:
When should end punctuation go inside quotes?
Is it correct to use “punctuation outside of the quotations”, or “inside?”

Let me know if this belongs on Writers.se. Furthermore, I have a strong feeling this has already been covered, but I wouldn’t know where, since I don’t know what to name this situation.

Moving on, I will express a dialogue like this:

A:  “What did he say to you?’

B1:  “He leaned close to me, and said in a gravely and drunken voice, “It’s not easy.” ”

Or would it be,

B2:  “He leaned close to me, and said in a gravely and drunken voice, ‘It’s not easy.’ ”

Or,

B3:  “He leaned close to me, and said in a gravely and drunken voice, “It’s not easy”.”

I’ve tried to be helpful (and probably failed), but let me know.