The correct answer is option 'c) Muhammad-bin-Tughlaq'.

Muhammad-bin-Tughlaq was a 14th-century Sultan of Delhi who ruled from 1325 to 1351. He is known for his ambitious and often controversial policies, one of which involved the remodelling of the coinage and the issuance of new coins.

**Background:**
During the reign of Muhammad-bin-Tughlaq, the economy of the Delhi Sultanate was facing several challenges. The value of the currency was declining due to the debasement of coins, which had led to inflation and a loss of public trust in the currency. To address these issues, Muhammad-bin-Tughlaq decided to remodel the coinage and issue new coins.

**Coin Remodelling:**
Under the new coinage system introduced by Muhammad-bin-Tughlaq, two new coins were issued - a gold coin called Dinar and a silver coin called Adali. These coins were designed to have a specific weight in order to reflect the altered values of the precious metals.

- The new gold coin, Dinar, weighed 200 grains. This was a significant departure from the previous gold coins, which had a different weight and purity.
- The new silver coin, Adali, had a weight of 140 grains. This was also different from the previous silver coins in terms of weight and purity.

**Purpose and Impact:**
The remodelling of the coinage and the issuance of new coins had several purposes and impacts:

1. Standardization: The new coins aimed to standardize the currency system and ensure uniformity in weights and purity. This was intended to restore public trust in the currency and stabilize the economy.

2. Value Adjustment: The altered values of the precious metals reflected the changing economic conditions and the need to maintain the value of the currency in relation to the intrinsic value of gold and silver.

3. Control over Economy: The introduction of new coins also allowed the Sultanate to have greater control over the economy. By issuing new coins, Muhammad-bin-Tughlaq could regulate the money supply and potentially address the issue of inflation.

4. Challenges and Backlash: However, the introduction of new coins faced several challenges and led to unintended consequences. The sudden change in the currency system created confusion and disrupted trade. The new coins were not readily accepted by the people, and there were instances of counterfeiting. These factors contributed to the failure of the new coinage system.

In conclusion, Muhammad-bin-Tughlaq, the Sultan of Delhi, remodelled the coinage and issued new coins during his reign. The introduction of the Dinar and Adali coins aimed to address the economic challenges faced by the Delhi Sultanate. However, the new coinage system faced various challenges and was ultimately unsuccessful.

Muhammad bin Tughluq was a great scholar and a great patron of learning..he has introduced a new tokan currency ..The sultan,on finding out a shortage of silver currency in the kingdom, decided the issue of copper coins to token currency in 1329..Now, with these copper as well as bronze coins people can buy same things with those of silver coin called tanka.....