A building can be awarded three star rating under GRIHA Rating Norms 2019 if its point score is:

Correct option is B

Explanation:
As per GRIHA (Green Rating for Integrated Habitat Assessment) Rating Norms 2019, the three-star rating is awarded to buildings that score between 61 and 70 points. A score of 68 falls within this range, thereby qualifying for the three-star category.
Information Booster:
GRIHA is a national green building rating system in India developed by TERI and endorsed by the Ministry of New and Renewable Energy (MNRE). The rating scale ranges from 1 star to 5 stars, based on environmental performance and sustainability of buildings.
· 1 Star: 25–40 points
· 2 Star: 41–60 points
· 3 Star: 61–70 points
· 4 Star: 71–85 points
· 5 Star: >85 points
Additional Knowledge:
· 72 points (Option 1) qualifies for 4-star rating.
· 52 points (Option 3) qualifies for 2-star rating.
· 81 points (Option 4) also qualifies for 4-star rating, but on the higher end.