$A$. According to Clowes root apex consists of an inverted cup like structure.
$B$. Low amount of $RNA$, $DNA$ and protein is characteristic of waiting meristem.
$C$. Cells of reserve meristem can divide only when the root apex gets injured.

• A

  All are correct

• B

  $A\; and\;C$ are incorrect

• C

  $A\; and\;B$ are incorrect

• D

  $B\; and\;C$ are incorrect