Who among the following included the composition of Guru Tegh Bahadur ji in the Guru Granth Sahib?
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Guru Gobind Singhji's efforts to include the teachings of previous Gurus in the Guru Granth Sahib were instrumental in preserving Sikh spiritual knowledge.
Guru Gobind Singhji, the tenth Sikh Guru, included the hymns of Guru Tegh Bahadur ji in the Guru Granth Sahib. Guru Tegh Bahadur ji's teachings and sacrifices were pivotal in the history of Sikhism, and his hymns are an integral part of the Guru Granth Sahib, the holy scripture of Sikhism.
Thus, the correct answer is (B) Guru Gobind Singhji.