Round Your Answer to Two Decimal Places $D$ From the Source $5 \mathrm { ft }$

Round your answer to two decimal places.
-The intensity I of light varies inversely as the square of the distance $D$ from the source. If the intensity of illumination on a screen $5 \mathrm { ft }$ from a light is 3 foot candles, find the intensity on a screen $15 \mathrm { ft }$ from the light.

A) $\frac { 1 } { 4 }$ foot-candle
B) 2 foot-candles
C) $\frac { 1 } { 3 }$ foot-candle
D) $1 \frac { 1 } { 3 }$ foot-candles