During hyperinflations,

A. money no longer functions as a good store of value and people may resort to barter transactions on a much larger scale.

B. middle-class savers benefit as prices rise.

C. money's value remains fixed to the price level; that is, if prices double so does the value of money.

D. the value of money rises rapidly.

A. money no longer functions as a good store of value and people may resort to barter transactions on a much larger scale.

Explanation:

Hyper Inflation can be defined as inflation i. e price rise occuring at highly accelerating pace.

Such exponentially rising prices reduce the value (purchasing power) of money.

So - people don't use it as a 'store of value' (saving for future purposes), since its future value is anticipated to be very lower. It is also used less as a 'medium of exchange' (transaction purposes), because of its less purchasing power.