Who was the teacher of Chandragupta Maurya?

Correct option is B

Correct Answer: is option (b): Vishnu Gupta
Explanation:
Vishnu Gupta, also known as Chanakya or Kautilya, was the teacher and mentor of Chandragupta Maurya.
Chanakya was a brilliant political strategist, economist, and philosopher. He authored the Arthashastra, a treatise on statecraft, economy, and military strategy.
Information Booster:
Mauryan Dynasty: 
Founded by: Chandragupta Maurya in 321 BCE with the guidance of Chanakya.
Capital: Pataliputra (modern-day Patna, Bihar).
Key Rulers:
Chandragupta Maurya (321–297 BCE):
United large parts of northern India by defeating the Nanda dynasty and resisting Greek forces under Seleucus I.
Bindusara (297–273 BCE):
Chandragupta's son expanded the empire further into southern India.
Ashoka the Great (268–232 BCE):
Known for his military conquests, including the Kalinga War.
Converted to Buddhism after the Kalinga War and promoted non-violence and dharma (righteousness).
Spread Buddhism to Sri Lanka, Southeast Asia, and beyond.
Decline:
The empire declined after Ashoka's death due to weak successors and internal strife.
The last ruler, Brihadratha, was overthrown by Pushyamitra Shunga in 185 BCE, marking the end of the Mauryan dynasty.