The correct answer is (b) 9.
The Uttarakhand Legislative Assembly is the unicameral legislature of the Indian state of Uttarakhand. It consists of 70 members, elected from single-member constituencies by first-past-the-post voting. Of these, 9 seats are reserved for candidates from the Scheduled Castes.
The Scheduled Castes are a group of historically disadvantaged communities in India. They are listed in the Constitution of India as being socially, educationally, and economically backward. Seats in the Legislative Assembly are reserved for candidates from the Scheduled Castes in order to ensure that they have a fair representation in the government.
The other options are incorrect because they do not represent the actual number of seats reserved for the Scheduled Castes in the Uttarakhand Legislative Assembly.