For this question, i believe the simplest way is to test the answer choices.
From the stem, it flows that her score, before the last trial, will be 1 or -1.
To get -4 as final score she must have 4 or -1. This is possible if she gets -1 in the last trial.
Keep on testing, we see that the answer choices A through D work.
But E does not work: to have 6 as final score, she must get a score of 5 or 7 in the last trial. both value are not multiple of 3.
From the stem, it flows that her score, before the last trial, will be 1 or -1.
To get -4 as final score she must have 4 or -1. This is possible if she gets -1 in the last trial.
Keep on testing, we see that the answer choices A through D work.
But E does not work: to have 6 as final score, she must get a score of 5 or 7 in the last trial. both value are not multiple of 3.
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