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".
Q: [header] How to plant clematis [title] Pick a clematis cultivar. [step] Clematis flowers come in an enormous range of shapes and colors, from pink blooms that span 6 inches across to drooping blue bells to starry white flowers. They've grown in popularity in recent years, so many nurseries offer dozens of varieties to choose from. <sep> (A) You'll also be able to buy several varieties, depending on the variety of plant in the mix. [substeps] Some species' leaves grow fastest in an hardiness zone, while others grow very slowly in a temperate climate. (B) When you decide which cultivar to buy, take the color, shape, potential side and sun requirements into account. Clematis often take several years to flower, so look for a potted plant that's already a year or two old. (C) Visit one to get a sense of the species, then use your eyes to find the right size variety for your specific growing conditions. [substeps] Air balleful varieties are generally two to six inches in diameter, while spring-flowering varieties can grow tall over 8 inches. (D) Consult an experienced gardener who can study them thoroughly before purchasing them. [substeps] Determine which plant hardiness zone you'll be growing clematis in.
A:
B