At what distance from the light source will the light intensity be 256 lux?

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In a dark indoor environment one single Axis illuminator is available. At a distance of 1 m (3 ft 3 in) away from the illuminator the light intensity is 1024 lux.

At what distance from the light source will the light intensity be 256 lux?
A . 2m (6 ft 7 in)
B . 4m {13 ft 1 in)
C . 8m (26 ft 3 in)
D . 16m (52 ft 6 in)

Answer: A