A tank initially contains 7 gallons of water. A faucet is opened and water begins pouring into the tank at a rate of 1.5 gallons per minute until the tank is full. Which of the following represents the volume V of water in gallons in the tank as a function of time t in minutes that has elapsed since the faucet is opened?

A) v(t)=1.5+t
B)v(t)=8.5+t
C)v(t)=1.5t
D)v(t)=1.5t-7
E)v(t)=1.5t+7
Thanks