The correct answer is: Red.
Bagh shawls are a type of shawl that is made in the state of Haryana, India. They are typically made from wool and are decorated with intricate embroidery. The most common color used to make Bagh shawls is red. This is because red is considered to be a auspicious color in Hinduism, the religion of the majority of people in Haryana. Red is also associated with love, passion, and fertility.
The other options are incorrect because they are not the most common colors used to make Bagh shawls. Orange is a secondary color that is made by mixing red and yellow. Green is a primary color that is associated with nature and growth. Black is a secondary color that is made by mixing blue and red.
In conclusion, the correct answer to the question “Which colour is mostly used to prepare Bagh shawl in Haryana?” is Red.