Which of the following is a famous botanical garden located in England?

Which of the following types of plants are grown in a botanical garden?

Which of the following is also known as a $Zoo$?

Which method is used in the process of poisoning (preservation of biological specimens)?

$S$ Statement: Insects are caught,killed,and pinned in insect boxes for preservation.
$R$ Reason: Large animals like birds and mammals are usually preserved by stuffing.
$(a)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.

Which classification system is used in most of the world's prominent herbaria?