Which Himalayan plant species has become vulnerable due to overexploitation?

Correct option is D

The Himalayan Yew (Taxus wallichiana) is a slow-growing coniferous tree found in the Himalayan region, especially in Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh. This plant is highly valued for producing taxol, a chemical compound used in cancer treatment, especially for ovarian and breast cancers.
Due to overharvesting for its bark and leaves, coupled with its slow regeneration, the species has been pushed towards the vulnerable category as per the IUCN Red List. Overexploitation without sustainable practices has led to a significant decline in its natural population.