Explanation:

Chickpea, also known as Chana, is widely referred to as the 'King of Pulses' due to its significant nutritional value, versatility in culinary uses, and widespread cultivation and consumption globally, especially in India. Option (1) 'Tur' (Pigeon pea), (2) 'Pea', and (4) 'Moong' (Green gram) are indeed important pulses, but they do not hold the distinguished title of 'King of Pulses' in common agricultural parlance. Chickpea's robust nature and economic importance contribute to this designation.