Correct Option
Assertion (A) is true. Muhammad bin Tughlaq introduced new gold and silver coinage during his reign. The Moroccan traveler Ibn Battuta, who visited the Delhi Sultanate, referred to these new gold coins as 'Dinar'. This was part of the Sultan's broader currency reforms.
Incorrect Options
Reason (R) is false. Muhammad bin Tughlaq's token currency experiment involved the issuance of copper and brass coins, not gold coins. The primary objective was to address a shortage of silver within the empire and to substitute silver Tankas for domestic transactions. This measure was not intended to promote foreign trade with West Asian and North African countries using gold token currency. Gold, being a precious metal, was not utilized for token currency.
Options (1), (2), and (4) are incorrect because Reason (R) is factually false. Options (1) and (2) incorrectly state that R is true. Option (4) incorrectly states that A is false.