Which of the following is used to indicate an indirect source?

A. qt. in

B. qtd. in

C. quo. in

D. qtd. Ind.

The correct answer is B. qtd. in

According to the MLA rules, an indirect quote is a source cited in another source - so you are using the secondary source to find the quote you want to use in your own paper. This is something that should be avoided - if you can, it's better to use a primary source as your example.