Which of the following statements is not true for radioactive decay?

• A
  Amount of radioactive substance remaining after three half-lives is $1/8$th of the original amount.
• B
  Decay constant does not depend upon temperature.
• C
  Decay constant increases with an increase in temperature.
• D
  Half-life is $\ln 2$ times of $1/\lambda$ (where $\lambda$ is the decay constant).