Under Certain Conditions, About 20 Molecules, on Average, Are Predicted

Multiple Choice

Under certain conditions, about 20 molecules, on average, are predicted to exist in each β-octylglucoside detergent micelle. If the critical micelle concentration for this detergent is about 20 mM under these conditions, at what total β-octylglucoside concentration are about half of the detergent molecules found in micelles?

A) 1 mM
B) 10 mM
C) 20 mM
D) 21 mM
E) 40 mM