How is the CAP'S noun clause used in this sentence?

What I want to know is HOW ARE WE GOING TO PAY FOR THIS.

A. Subject
B. Direct Object
C. Object of a Preposition
D. Predicate Nominative

Your previous question was answered for you. Now it's your turn.

Look through the types of clauses and let us know what you think.

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

Hi Writeacher, I was wondering if you could take a look at my question jiskha(dot)com/display.cgi?id=1361488610

I don't know if you already have and decided not to answer it (never mind if you already did look at it), it's just that I've seen you edit some other people's texts a few times. But I would totally understand if editing a chemistry lab report introduction is too much (I know it's asking for a lot).

I looked at that post, but quickly realized that I don't understand it enough to proofread. Sorry.

That's alright, thanks though.

Keep checking your post in case a science tutor reads it.

I actually already got one to read it and he said, "I see nothing 'wrong'." so I guess nothing "wrong" with quotes would mean there are some technical issues or something, I don't know. but this time around I was loOking more for a grammar check, but I can do without

(which is why I put it under English this time, rather than chemistry)