Thanks very much for the observation. As I re-read the question and the answer, it is clearly confusing, in particular the double negative implied by a minus sign placed in front of a sell position.
I have changed the choices available, taken out the minus signs and made it easier to focus on just the put-call parity that question is trying to clarify.
Also – another thing that might help in getting a conceptual understanding of the put-call parity is the article here: https://riskprep.com/all-tutorials/35-exam-13/53-introduction-to-vanilla-options
Mukul Pareek