Sorry if my English is hard to understand because it is not my first language. What I am trying to say is, the type of question that has a chance to catch you not reading the answers properly, in this case "suchiyuwa-desu" and "suchuwa-desu", is making it a trick question instead of a remembering question. You can immediately skip the two answers that doesn't look identical, go straight to the two answers that looks the same, and then choose the one with the one with sokuon, almost always correct. This shouldn't be the case since sometimes I will answer wrongly a question because picking the one without sokuon, and other time just blinding pick the one with sokuon and just be correct even tho I don't even know what the word is.
If you're using the answers to eliminate choices, then you're treating renshuu like a test in which the points are the most important, and not the learning (which obviously is the goal for everyone on renshuu).