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".

[header] How to identify a bed bug infestation [title] Check your mattress for bedbugs. [step] Bedbugs tend to live and migrate towards mattresses, box springs, bed frames, and headboards. These are small, brownish red insects that are oval in shape. <sep> (A) They live off of the blood in animals and humans. Look around the edges of your mattress, the creases of your sheets, and pillowcases. (B) The pests can be found in all corners of your mattress, along the whole lower half of the bed frame and on the sides, walls, and in any crevices where mold is present. These are often mistaken for a bed bug, as they have a head and a fuzzy body. (C) They are virtually non-visible on the bed bed-frame or on the comforter. [substeps] Be on the look out for bedbugs. (D) Bedbugs attach to your bed frame by crawling onto it, pressing their noses into it, and following it. [substeps] Bedbugs climb bed frames to the top and bottom with long, slender antennae.
A