Which Statement Best Explains Why Hellenistic Monarchs Preferred to Collect

Which statement best explains why Hellenistic monarchs preferred to collect their taxes in coins?

A) They needed to pay their armies in cash.
B) It forced people to move to the cities they founded.
C) The amount of produce that might be collected as in-kind payment, primarily grain, was impossible to store in large quantities.
D) It was more efficient than mining precious metals.
E) It facilitated the development of a sophisticated system of credit.