What is effectiveness of fin?

• A. the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at base temperature
• B. the heat which would be transferred if entire fin area was at base temperature to the ratio of actual heat transferred from fin area
• C. the heat which would be transferred if entire fin area was at minimum temperature to the ratio of actual heat transferred from fin area
• D. the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at minimum temperature