How to show radio buttons as empty - initial view

[B_1]

We have a quiz project. Frame 1 starts out with all radio buttons empty. When one is selected, and
the answer button is clicked, the question is scored, and the next frame (question) appears. (Good).
But it appears with the same button already showing as selected. How can we have all the buttons in the new frame appear empty (initially) until a new answer is clicked?

EG: If rb1_mc is clicked in Frame 1, frame 2 shows up with rb1_mc already showing a
selection, even if it is not the right one. How can we have frame 2 also show up with nothing selected?
Thanks ! B_1

ps: am very much a nOOb - so please excuse me if question not explained properly.

[B_1]

What I found that works:
Frame 1 uses rb1_mc, rb2_mc, rb3_mc

So did the other frames.

So I changed Frames 2 , 4 and 6 to use rb4_mc, rb5_mc, rb6_mc
and changed the correct answer to the corresponding 4, 5 or 6 in those frames.

I left Frames 1, 3, 5 alone.
Works fine !!