Just something to remember - when LSAC asks which response option most strengthens an argument, that does not mean it has to strengthen it very much. There are two possibilities. Four of the response options can strengthen it somewhat and the fifth can strengthen it a lot. Or, four response options may not strengthen it at all and the fifth one (TCR) can strengthen it just a little. Whenever there is a which most strengthens it question, the amount of strength necessary for a response option to be correct mus be measured against the other choices.
Actually, this is a common misconception. In a strengthen question one AC will strengthen the argument, even by a minute amount, and the other four will weaken it or be completely irrelevant from a logical perspective. They may seem to strengthen the argument from an anecdotal or 'common sense' view, but when the argument is boiled down to its logical elements each will be found lacking.