The UX is awkward, at least on medium sized iPhone. It’s not clear how the answer is selected _and_ submitted. So I scrolled to the bottom for the next button.

The UX is awkward, at least on medium sized iPhone. It’s not clear how the answer is selected _and_ submitted. So I scrolled to the bottom for the next button. Then I scrolled to the top. Not seeing an “obvious” sign, my next thought was site must not work on my phone. Only then did I realize the questions were advancing.