How to deal with this kind of form?


The situation is as follow. 
First, I pressed enter on a form, then there are choices for me to choose, e.g. there are 4 choices. When I pressed down arrows, the first one was selected automatically and the page was refreshed. How to choose the other choices in this kind of form using NVDA? I've faced with this kind of form for many times but don't know how to deal with it. 
Thank you. 

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