Explanation:

1, 2 and 3

The statement "Indonesia learnt the art of growing betel leaves from India" is correct. Betel leaves were indeed cultivated and used extensively in India, and the practice likely spread to other regions including Indonesia.

The statement "India learnt the art of growing cotton from China" is incorrect. Cotton cultivation is believed to have originated in the Indian subcontinent, particularly in regions of present-day India and Pakistan. There is no evidence to suggest that India learned cotton cultivation from China.

The statement "Indians acquired the craft of minting gold coins from China" is also incorrect. Gold coinage was a well-established practice in India long before any significant interaction with China in terms of coinage technology. Indian civilizations such as the Mauryas and Guptas minted gold coins, and there is no historical evidence to suggest that this practice was borrowed from China.

Therefore, the correct option is 4 as all statements are incorrect.