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 track tornadoes [title] Watch doppler radar for severe storm cells. [step] Doppler radar detects the speed and movement of a storm by using radio wave pulses and it is highly accurate. There are different colors to signify the intensity of a storm. <sep> (A) [substeps] Doppler radar does not detect larger goose bumps, compared to doppler radar in humans. Doppler radar maps use higher frequency signals and are written to better identify an object than radar charts. (B) Greens indicate light rain, yellows and oranges are moderate to heavy rains, and red means very heavy rain or hail. [substeps] Use a weather app on your phone, visit weather websites like weather.com and weather underground, or watch your local news for up to date doppler forecasts. (C) [substeps] Doppler radar radar does not fire at specific types of people. Telethycline repelled asleep minutes before a storm appeared. (D) [substeps] Tornadoes usually report telling you the direction of megaheros. This message will be in your radar's dialogue box after it summarizes the storm status.
A:
B