What is the average lifespan of a crocodile (in $years$)?

Assertion $A$: No organism is immortal.
Reason $R$: Death is a mysterious phenomenon.
Which option is correct for Assertion $A$ and Reason $R$?

Choose the correct options from the following:
$I$. Annual and biennial plants show clear-cut vegetative,reproductive,and senescent phases.
$II$. Bamboo species flower only once in their life,generally after $50-100$ years.
$III$. $Strobilanthus$ $kunthiana$ is a monocarpic plant which flowers only once after $12$ years.

$A-$ Events after the formation of zygote are called post-fertilization events.
$R -$ In viviparous animals,a young one develops outside the mother's body.

Parameters of old age are

Identify the figures $a, b,$ and $c$ respectively.