For the following set of scores, what is ERA and ERB? Condition A: 4 6 3 8 Condition B: 2 5 6 1 O a. ERA = 21.5, ERB = 14.5 O b. ERA = 21, ERB = 14 O c. ERA = 21.5, ERB = 14 O d. ERA = 21, ERB = 14.5