Instructions: 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".
Input: [header] How to care for an iguana [title] Provide your iguana with lots of light. [step] To thrive, iguanas need access to certain types of light. Most importantly, iguanas need ultralight light that is in the uvb spectrum. <sep> (A) The uvb rays of the sun directly strike the basking area of the tank, heating it up enough to maximize the uvb basking power you receive in your aquarium. This gives your iguana a longer " extended " lifespan. (B) Without this sort of light, your iguana could suffer from a deficiency of vitamin d, be unable to absorb calcium, and have other health problems. [substeps] Purchase uvb light bulbs that are specifically labelled for reptiles. (C) At the food and shade section of the aquarium, your iguana will have the most access to these types of light : [substeps] Fluorescent light. This source is located under the uva lamp at a normal temperature, and is plugged into a socket beneath the uvb lamp. (D) [substeps] One source of these light sources are fluorescent and incandescent incandescent light bulbs. The type of light you should provide is dependent on your iguana's wattage and the environment you live in.
Output:
B