The correct answer is: C. 5767 MW
The power capacity availability in the Bihar state in the year 2019 was 5767 MW. This is an increase of 10% from the previous year. The increase in power capacity is due to the addition of new power plants and the improvement of existing power plants. The increase in power capacity will help to meet the growing demand for electricity in the state.
Option A: 4767 MW is incorrect because it is the power capacity availability in the Bihar state in the year 2018.
Option B: 4867 MW is incorrect because it is the power capacity availability in the Bihar state in the year 2020.
Option D: 5867 MW is incorrect because it is the power capacity availability in the Bihar state in the year 2021.
Option E: None of the above is correct because it is not a valid option.