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The total number of trials was 40. To find the relative frequency of selecting a diamond, we look at the number of trials where a diamond was selected (12) and divide it by the total number of trials.
Relative Frequency = Number of trials selecting a diamond / Total number of trials
Relative Frequency = 12 / 40
Relative Frequency = 0.30 or 30%
Therefore, the correct answer is 30%.