I would say C is the only one suitable for use in formal tone. I'm also tempted to give A a pass for use in casual speech. I'm guessing nobody else here will agree with me on this, though.

Eu quero aprender portugyes mais não tenho dinheiro

The verbs in the other sentences are wrong

I didn't go to Paris last week is the correct answer because this is the past simple negative tence.

I chose the third solution because of the notion of time "last week".