Multi-choice problem: Continue writing the next sentence in this paragraph:

How to change the batteries in your smoke detector
Check the battery type.
Installing the new batteries incorrectly, or using the wrong type, will cause your smoke detector to not function. Always make sure you are using the correct type of battery and installing the batteries correctly to ensure the detector will work.

a). Detectors that use lithium batteries will last for ten years. You generally cannot replace the battery, instead, replace the entire detector after its ten year life span is expired. b). Most smoke detectors turn off automatically after you push on the doorbell. If yours does not, check the battery stand to ensure it is properly set up. c). Get a solar panel to cover the floor. When setting the base, you need to make sure that the solar panel matches the type of ground layer the solar panel covers. d). Many brands of batteries range from black-out state batteries to white nickel metal batteries that you buy at your local hardware store. You can use a multimeter to check the battery's battery specs.
a).