Critical Micelle Concentration $(CMC)$ for a soap solution is $1.5 \times 10^{-4} \ mol \ L^{-1}$. Micelle formation is possible only when the concentration of soap solution in $mol \ L^{-1}$ is:

• A
  $7.5 \times 10^{-5}$
• B
  $1.1 \times 10^{-4}$
• C
  $2.0 \times 10^{-3}$
• D
  $4.6 \times 10^{-5}$