Consider the following statements:
$X:$ Rothmaler divided Bryophyta into three classes.
$Y:$ Iyengar is considered the father of Indian Bryology.
$Z:$ Shiv Ram Kashyap is considered the father of Phycology.

• A
  $X$ is false,$Y$ and $Z$ are true.
• B
  $Y$ is true,$X$ and $Z$ are false.
• C
  $X$ is true,$Y$ and $Z$ are false.
• D
  $X$ and $Z$ are true,$Y$ is false.