B
1) Who is the author of the book "Satyarth Prakash"?
Explanation :
Satyarth Prakash ("The Light of Meaning of the Truth" or The Light of Truth) is a 1875 book written originally in Hindi by Maharishi Dayanand Saraswati, a renowned religious and social reformer and the founder of Arya Samaj. It is considered one of his major scholarly works.