After T Years,the Value of a Wheelchair Conversion Van That $\frac { 7 } { 8 }$

Multiple Choice

After t years,the value of a wheelchair conversion van that originally cost $39,000 depreciates so that each year it is worth $\frac { 7 } { 8 }$ of its value for the previous year.Find a model for V(t) ,the value of the van after t years. ​

A) $V ( t ) = - 39,000 \left( - \frac { 7 } { 8 } \right) ^ { t }$
B) $V ( t ) = 39,000 \left( - \frac { 7 } { 8 } \right) ^ { t }$
C) $V ( t ) = - 39,000 \left( \frac { 7 } { 8 } \right) ^ { t }$
D) $V ( t ) = 39,000 \left( \frac { 7 } { 8 } \right) ^ { t }$
E) $V ( t ) = 39,000 \left( \frac { 7 } { 8 } \right) ^ { - t }$