Which is a better mode of reproduction: sexual or asexual? Why?

Reproduction is

Assertion: Clones are produced by sexual reproduction.
Reason: These are prepared by a group of cells descended from many cells or by inbreeding of a heterozygous line.

Which of the following are types of reproduction in organisms?

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

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.