Explanation:

Coins were called by popular names such as : anna, cash, dhinglo, dokdo, doudou, dub, escudo, fanam, faruqi, karshapara, kas, kon, mohur, naya paisa, pagoda, panam, pice, pie, rupia, suvarna, tanga, and tanka.

The fanam was a small coin used in south India between the 9th and 19th centuries. These small gold coins weighed as little as 0.3 grams and had a diameter of less than a centimetre.

Hence option (b) is the correct answer.