Well, I just took the alternate test, with the exact same answers, so I would know which one I missed. Only, the wrong answer I gave on the first test wasn't on this alternate test.
Which cleared up a doubt I had, and also meant I scored 100% on the alternate test.
Spoiler Warning for anyone who hasn't taken the test yet.
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The first test included the answer "four" for how many times Lois wore a wedding dress. I added the weddings and came up with four, but I forgot it was Clois wearing the dress in the one wedding, so I got that wrong. On the second test, four wasn't an option, so I got the answer right.