Q: 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 cage tomatoes [title] Use metal tomato cages if you don't have a lot of space in your garden. [step] Metal cages are thin and flexible, so you can squeeze them into a smaller space. This is especially helpful if your tomato plants are planted close together. <sep> (A) They can also help prevent the tomatoes from fleeing when the weather warms up. [substeps] Metal cages will cost between $10-20 usd per square foot. (B) They also insulate the tomato from the elements and help produce oxygen, which will kill the plants. [substeps] Metal cages should also be tall and at least 12-15 feet (3.7-5.7 m) high. (C) [title] Get tomato cages that are at least 5 feet (1.5 meters) tall. [step] 5-foot cages will support most tomato varieties. (D) [substeps] [title] Space tomatoes in groups of five. [step] A single tomato group of six to ten tomatoes in row is about three to four square feet.
A:
C