Quiz not functioning correction

Hello

I was testing the quiz part and no matter what I do it always says I skip a question even when I answer it. Could you take a look and see what I am doing wrong? I would love to purchase the plugin advanced features but need to make sure it works fr=irst.

https://studynetworking.net/courses/cisco-icnd-1/quizzes/basics-of-networking-quiz/

Thanks!