Correct Answer:
Option B - Muhammad-bin Tughluq's reign was known for many ambitious schemes. These scheme failed and brought ruin to the empire. He imposed taxation in Doab and transfered his capital from Delhi to Devagiri, renamed Daulatabad. The Sultan introduced coins of copper and brass that could be exchanged for fixed amounts of gold and silver from the Delhi Sultanate. This was known as a tanka (later modified to taka in Bengali). These two plans got failed.
B. Muhammad-bin Tughluq's reign was known for many ambitious schemes. These scheme failed and brought ruin to the empire. He imposed taxation in Doab and transfered his capital from Delhi to Devagiri, renamed Daulatabad. The Sultan introduced coins of copper and brass that could be exchanged for fixed amounts of gold and silver from the Delhi Sultanate. This was known as a tanka (later modified to taka in Bengali). These two plans got failed.