Which among the following languages was not learnt by Guru Gobind Singh during his Guruship?

The correct option is B Greek
Guru Gobind Singh was trained by his father, Guru Tegh Bahadur, for the Guruship. During his training, he learnt Persian from Qazi Pir Mohammed, Sanskrit from Pandit Harjas, and Gurmukhi from Bhai Sahib Chand and Bhai Mati Dass. He also learnt to ride horses and use weapons from Rajput Banjar Singh.