Read the following statements carefully and choose the right answer from the codes given below:
$I$. $PMA$ and silicon oil of low viscosity are considered as antitranspirants.
$II$. $BAP$,$NAA$,and cobalt chloride are also used as antitranspirants.
$III$. Abscisic acid $(ABA)$ affects the mechanism of opening and closing of stomata.
$IV$. Starch of guard cells is converted into $PEP$ (phosphoenolpyruvate) ions by the process of hydrolysis.
$V$. Potometer works on the principle of potential difference between the tip of the tube and that of the plant.
$VI$. Transpiration rate is directly proportional to the relative humidity.

• A
  $I, II, III, IV, V$ and $VI$ are correct.
• B
  $I, II, III$ and $IV$ are correct,while $V$ and $VI$ are incorrect.
• C
  $V$ and $VI$ are correct,while $I, II, III$ and $IV$ are incorrect.
• D
  $I, III$ are correct,while $II, IV, V$ and $VI$ are incorrect.