In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Q: [header] How to measure light intensity [title] Understand photometers that measure lux and foot-candles. [step] These are units that describe the intensity of light on a surface, or. Photometers that measure this are usually what people are looking for when they want to set up a photo shoot, or test whether a room is too bright or too dim. <sep> (A) [title] Familiarize yourself with photometers over other techniques. [step] Photometers can be very versatile. (B) [substeps] Some light meters are specialized for different types of lighting. For instance, one may produce more accurate results when used to measure sodium lighting. (C) [title] Use an online article on how to determine lux and foot-candles. [step] Find an online article about how to calculate lux during a flash. (D) [substeps] Measure lux by adding one pound of light at a time to the scale of a standard candle. For example, for a 4.5 lb candle, a quarter pound weight of light would make a half pound candle.
A:
B