Protein content in a particular farmer's soybean crop is normally distributed with a mean of 40 grams and a standard deviation 10 grams. Suppose we observe a soybean crop that has a protein content of 20 grams. Intepret the z-score value. Option A A soybean crop with a protein content of 20 grams is 2 standard deviations above the mean. Option B A soybean crop with a protein content of 20 grams is 2 standard deviations below the mean. Option C A soybean crop with a protein content of 2 grams is 20 standard deviations below the mean. Option D A soybean crop with a protein content of 2 grams is 20 standard deviations above the mean.