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

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".

Past tense verb