You can use the GROUP method to combine radio boxes in a horizontal fashion. Check this out:
Here's the code. If you have many entries you could use an array for all of the radio boxes.
Names Default To Here( 1 );
New Window( "Example",
panelbox("Make a selection for each question",
lineup box(ncol(6),
textbox("1. "), rb1 = radio box("A"), rb2 = radio box("B"), rb3 = radio box("C"), rb4 = radio box("D"), rb5 = radio box("E"),
textbox("2. "), rb6 = radio box("A"), rb7 = radio box("B"), rb8 = radio box("C"), rb9 = radio box("D"), rb10 = radio box("E"),
textbox("3. "), rb11 = radio box("A"), rb12 = radio box("B"), rb13 = radio box("C"), rb14 = radio box("D"), rb15 = radio box("E"),
)
)
);
rb1 << group(rb2);
rb1 << group(rb3);
rb1 << group(rb4);
rb1 << group(rb5);
rb6 << group(rb7);
rb6 << group(rb8);
rb6 << group(rb9);
rb6 << group(rb10);
rb11 << group(rb12);
rb11 << group(rb13);
rb11 << group(rb14);
rb11 << group(rb15);