The Himalayan Range is very rich in species diversity. Which one among the following is the most appropriate reason for this phenomenon

(a)

It has a high rainfall that supports luxuriant vegetative growth.

(b)

It is a confluence of different biogeographical zones.

(c)

Exotic and invasive species have not been invasive species and have not been introduced in this region.

(d)

It has less human interference.

Environment › Biodiversity