The correct answer is B) a change in government regulations.
What might cause a change in the value of fiat money is a change in government regulations.
Fiat money is the kind of money or currency that does not have the support of a tangible value such as silver or gold. It is the market that determines the value of money. That is why a change in government regulations might cause a change in the value of fiat money. If the government decides to modify the interest rates or takes another economic measure to solve a contingency, the decision can affect fiat money.
The other options of the question were A) a change in the value of commodities. C) a change in materials used to make money. D) a change in an individual's spending habits.