Which of the following Indian musicians was referred to as ‘Ghazal King’?

Correct option is B

The correct answer is (b) Jagjit Singh.
 Jagjit Singh was referred to as the 'Ghazal King' for his mastery and popularization of ghazal music in India.
 He was a renowned Indian musician known for his soulful renditions and contributions to the genre of ghazal.
 He was born in Sri Ganganagar, Rajasthan on February 8, 1941 and is credited with reviving the popularity of ghazal.
 His first album, The Unforgettables, was released in 1976 and was produced with his wife, Chitra Singh, a Bengali singer.
 Mehdi Hassan was a legendary Pakistani ghazal singer known as the "King of Ghazal" for his mastery and influence in the genre.