Choose the situation which would best be modeled by an exponential decay function.

A.
A bank account has fallen below a minimum balance and is being charged $1.50 per day in fees.

B.
A machine depreciates (loses value) by $1000 in its first year, by $2000 in its second, $3000 in its third, etc.

C.
A student’s test score decreases by 5 points for each question missed.

D.
An island is being eroded away and loses 10% of its beachfront every year.