The correct option is B Guru Har Krishan Ji
Guru Har Krishan was the eighth of ten Gurus of the Sikh religion. He ascended to the throne of Guruship on Sunday, 20 October 1661, at the young age of five years and became the youngest Guru in Sikhism. He attended to and served the suffering people with complete devotion and in the process himself contracted disease and died at the age of 8.