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 prune plum trees [title] Prune at the right time. [step] You can prune the tree while it is dormant in winter or in summer. Dormant pruning is pruning the tree during the late winter, when no new growth is happening and the tree doesn't have any leaves. <sep> (A) Pruning while the tree is dormant encourages vibrant growth come spring, and it's less likely to cause damage to the tree than summer pruning. Summer pruning can be used to slow the growth of a tree that is getting too big and to thin new growth that is overcrowding. (B) [title] Wait until the tree is near the height of its dormant season. [step] You might want to wait it out before pruning in winter because the plant will still haven't developed enough foliage to protect it from the cold winter weather. (C) Or, you could, if the tree is off-season, prune it during the summer. [substeps] Wait until after it has dead leaves, stunted branches, or splits in the bark. (D) You can begin to prune the tree in mid-spring just after it has returned to normal size, taking care to remove any dead or damaged branches. [title] Pick a healthy scene for your pruning.
A