When a Certain Industrial Machine Is T Years Old, Its $V ( t ) = 4,000 e ^ { - t / 4 } + 500$

Multiple Choice

When a certain industrial machine is t years old, its resale value will be $V ( t ) = 4,000 e ^ { - t / 4 } + 500$ dollars. How much does the resale value change between the 3rd and 4th years?

A) Decrease by $417.95
B) Decrease by $420.05
C) Decrease by $421.07
D) Decrease by $423.91