How would the end of following question be punctuated: ?" or ."? or "?

Why did Lewis say, "I don't care for pickles _____

What is your reference source?

Question

How would the end of following question be punctuated:  ?"  or   ."?   or   "?

Why did Lewis say, "I don't care for pickles _____

What is your reference source?

anonymous · Answer

I think that it would be 
Why did Lewis say, "I don't care for pickles"?
It makes sense.
My reference was my brain

anonymous · Answer

Why did Lewis say, "I don't care for pickles?"

The punctuation nees to be INSIDE the quotes.

My reference source is my college education.

anonymous · Answer

"I don't care for pickles?"

college student for writing

anonymous · Answer

"I don't care for pickles?"

just a student

anonymous · Answer

Why did Lewis say, I don't care for pickles"? 

my reference is my writing teacher.