Which of the following statements is incorrect?

• A
  It is not possible to compress a gas at a temperature lower than $T_c$.
• B
  At temperatures lower than $T_c$,molecules are close enough that attractive forces become effective,leading to condensation.
• C
  Condensation is not possible above $T_c$.
• D
  At temperatures higher than $T_c$,the kinetic energy of gas molecules is high,and the attraction between them decreases.