Detailed Instructions: 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 prevent theft [title] Change your home's exterior door locks if you've recently moved in. [step] For the optimum security, your home needs to be outfitted with strong deadbolts and door locks to keep your stuff and your family safe. You can, as door locks are easy and inexpensive to replace. <sep> (A) Once you do, always lock them and instruct anybody else you live with to always lock them. [substeps] It's possible that previous residents likely have kept a spare key, so it's a good idea to change the locks if you've just moved in, to help prevent theft. (B) [substeps] Note, though, that these locks cannot permanently protect your house. They are unlocked with a combination latch attached to one side of the exterior door. (C) Your home will also need to be made to obey local regulations regarding storing, repositioning, and disposing of potentially dangerous firearms. Contact your city officials to make an address change for your home. (D) You can also install new locks on hallways, stairs, or along and around entrances. [title] Install an alarm system to keep your stuff and family safe when not in use.
A:
A