Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to make your own wrestling ring [title] Buy four 8 foot (2.4 m) tall wooden posts. [step] Look for posts that are around 6 inches (15 cm) wide by 6 inches (15 cm) long. These posts will serve as the corners of your wrestling ring. <sep> (A) [title] Purchase six 6 by 6 feet (2.4 m) steel posts. [step] Draw or sketch these upon being laid down. (B) 2 15 foot posts will often serve as corners for the ring. There is a " anvil post " that you can use for this. (C) [title] Measure and mark 42 inches (110 cm) up from the bottom of each post. [step] That's where the floor of your wrestling ring will be. (D) [substeps] You can purchase wooden poles or duct tape as well. Two 8-foot posts can be used as the corner posts.
Student:
C