Which of the following was an effect of the discovery of gold and silver on western development?

A. It caused a Sharp Decrease in the population of eastern cities
B. There was no longer a need for the railroad
C. The value of gold and silver decreased
D. It Contributed to the opening of the western frontier.
I picked C. The value of gold and silver decreased. but im still thinking that it is D so im having some confusion any help would mean alot

C.

Explanation:

The value of gold and silver did decrease. While D. is a tempting choice, it is incorrect because it did not effect the DEVELOPMENT of gold and silver. A and B aren't correct for obvious reasons, and that only leaves C. Therefore I have proven this answer to be correct.

gaius cassius longinus and marcus junius brutus, former enemies of julius caesar who'd joined the roman senate, led caesar's assassination, dubbing themselves "the liberators." and the second one is   the assassination of julius caesar was the result of a conspiracy by many roman senators led by gaius cassius longinus, decimus junius brutus albinus, and marcus junius brutus. they stabbed caesar (23 times) to death in a location adjacent to the theatre of pompey on the ides of march 15 march 44 bc.

i believe your answer is d)