Hmm, this is a tough one. I'm going to have to go with B) 2.179 since it seems to be the closest to the typical t-value for a 13-sample, two-tailed test.
C) 2.064 looks like the right answer to me. The question mentions a two-tailed paired t-test with 13 samples and alpha = 0.05, so this value makes the most sense.
Viola
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