Consider the following chemical equilibrium of the gas phase reaction at a constant temperature: $A_{(g)} \rightleftharpoons B_{(g)} + C_{(g)}$. If $p$ is the total pressure,$K_p$ is the equilibrium constant,and $\alpha$ is the degree of dissociation,then which of the following is true at equilibrium?

• A
  If $p$ value is extremely high compared to $K_p, \alpha \approx 1$
• B
  When $p$ increases,$\alpha$ decreases
• C
  If $K_p$ value is extremely high compared to $p, \alpha$ becomes much less than unity
• D
  When $p$ increases,$\alpha$ increases