The correct answer is: D. Nitish Swachh Bihar Abhiyan
The Nitish Swachh Bihar Abhiyan is a government initiative to construct toilets in households in Bihar. The scheme was launched in 2016 and aims to make Bihar open defecation free by 2019.
The scheme provides financial assistance to households to construct toilets. The assistance amount is Rs. 12,000 per toilet. The scheme also provides training to masons on how to construct toilets.
The Nitish Swachh Bihar Abhiyan has been successful in constructing toilets in a large number of households in Bihar. As of March 2018, the scheme has constructed over 1.5 crore toilets in Bihar.
The scheme has also been successful in changing the mindset of people about open defecation. A large number of people have now started using toilets instead of open defecation.
The Nitish Swachh Bihar Abhiyan is a major step towards making Bihar open defecation free. The scheme has been successful in constructing toilets in a large number of households and changing the mindset of people about open defecation.
The other options are incorrect because they are not government initiatives to construct toilets in households in Bihar.