A Hose Has Been Clamped So That the Area at the Clamp

A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose.When we ignore the viscosity of water,the ratio of the volume of water delivered per unit time when the clamp is on to the volume of water delivered per unit time without the clamp is

A) $\frac { 1 } { 16 }$ .
B) $\frac { 1 } { 8 }$ .
C) $\frac { 1 } { 4 }$ .
D) $\frac { 1 } { 2 }$ .
E) 1.