Solve the Problem $D$ From the Source $5 \mathrm { ft }$

Multiple Choice

Solve the problem. Round as appropriate.
-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 2 foot-candles, find the intensity on a screen $15 \mathrm { ft }$ from the light.

A) $2 / 10$ foot-candle
B) $12 / 9$ foot-candles
C) $2 / 9$ foot-candle
D) 2 foot-candles