According to One Study, the Average Blood Cholesterol Level in 200

According to one study, the average blood cholesterol level in 200 non-diabetic hospitalized patients is 195 mg/dL and 210 mg/dL in 180 diabetic hospitalized patients. The stated likelihood that the observed difference is attributable to chance alone is 5%. There is also a 20% chance of determining that there is no change in blood cholesterol levels when there is. What is the study's strength?

A) 0) 05
B) 0) 20
C) 0) 50
D) 0) 80
E) 0) 95