Override layout of choice label in Apros theme to make it match specs from QA team.

problem_builder/public/themes/apros.css

@@ -3,6 +3,10 @@
     box-sizing: content-box;  /* Avoid a global reset to border-box found on Apros */
 }
 
+.mentoring .questionnaire .choice-label {
+    width: 100%
+}
+
 .themed-xblock.mentoring .choices-list .choice-selector {
     padding: 4px 3px 0 3px;
     font-size: 16px;