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". 

[EX Q]: The people start the race behind a closed and grated fence, which then opens and allows them to start racing from an elevated platform down onto the paved raceway. the racers <sep> (A) pedal with one person in a white jacket in the lead. (B) pass snow covered stands along a hilly road up above the as they ride up the hill past the tight stands and sandy roads of the garage. (C) sit against the wall on the track as they wait for the race to start. (D) pass through gaps while the passengers attempts to stay ahead.
[EX A]: A

[EX Q]: [header] How to introduce a pleco to a goldfish tank [title] Ask how large the pleco will grow to be. [step] Although most pet stores will sell plecos that are only a few inches in length, you should know that they can grow quite large. Fully grown plecos can reach up to two feet in length. <sep> (A) [title] Check your tank's surface before you place the pleco into the tank. [step] Make sure that your aquarium is opaque or has a drop-down tray so that your pleco is not exposed to water. (B) This can have a negative impact on their lifespan. [title] Choose a tank with large walls and no air holes. (C) [title] Make sure you cover more than twice the tank. [step] If you find that your pleco grows too much, cover the entire tank with a blanket. (D) The exact size of the pleco will vary depending on the species. Ask someone at the pet store how large the pleco will get before making a purchase.
[EX A]: D

[EX Q]: [header] How to grow a bond with your betta fish [title] Select a healthy betta. [step] With proper care, betta fish regularly live for two-to-four years, and can occasionally reach ten years. Choosing a healthy fish and giving it proper care are your best chance for a lasting relationship. <sep> (A) Most betta fish do not have as large their owners expect. A healthy tank will serve as a good breeding ground for your betta, and a safe and quiet home for your betta fish will provide a safer environment for it to live in. (B) Trust your gut feeling and know that the fish you adopt and the needs of a betta will work very well in your home. [title] Look for a good source of natural pet resources. (C) [substeps] Most pet stores carry far more male than female bettas, because the former are more colorful and have larger fins. Whether you choose a male or female, look for a fish with a bright (not dull) color palate and healthy-looking, undamaged fins. (D) [substeps] Make sure to house your betta properly and expose it to direct sunlight so it can get a good meal in the evening before they go into the tank. Treating your betta as a member of your family and family can be a positive experience.
[EX A]:
C