Select the appropriate option regarding the term 'The Evil Quartet'.

$Parthenium$ (carrot grass) that came into India has become ubiquitous in occurrence and causes pollen allergy.

$A$ species which was introduced for ornamentation but has become a troublesome weed in India is:

In Lake Victoria of East Africa, more than $Y$ species of $X$ fish became extinct together. Identify $X$ and $Y$.

Which of the following statements is correct regarding Parthenium (Carrot grass)?
$(a)$ It was introduced into India as a contaminant with imported wheat.
$(b)$ It causes allergies.
$(c)$ Asexual reproduction occurs in its flower.

Statement $(A)$: The Caspian tiger, a subspecies of tiger, is one of the recently extinct animals.
Reason $(R)$: The colonization of tropical Pacific islands by humans.