Option 1: Ala-ud-din Khilji was a 14th-century Delhi Sultan who is known for his strict rule and taxation policies. However, there is no historical evidence to suggest that he imposed the Jizya tax specifically on Brahmins.

Option 2: Firuz Tughluq was a 14th-century Delhi Sultan who indeed imposed the Jizya tax on all non-Muslims, including Brahmins. He was known for his religious tolerance but still imposed this tax to generate revenue for the kingdom.

Option 3: Muhammad Tughluq was a 14th-century Delhi Sultan who was notorious for his unpredictable and erratic policies. While he did impose various taxes, there is no evidence to suggest that he specifically imposed the Jizya tax on Brahmins.

Option 4: Balban was a 13th-century Delhi Sultan known for his strong centralization of power and strict rule. However, there is no historical evidence to suggest that he imposed the Jizya tax specifically on Brahmins.

Therefore, the correct answer is Option 2: Firuz Tughluq.