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

How to choose devices for testing your mobile app
Define your app's specifications.
If your app is suitable for specific screen resolutions, sizes, etc. , include only the devices that support these features.

Choose from: A). You should also confirm your device supports these features by researching the device manufacturer and reading the suggested user requirements. Your website may offer some background information on the devices you will be testing, but if you do not have a complete list of users, search for the manufacturer's name online.; B). Above all, you want to stick to the optimum specifications. If you use more than 12 devices, let them each have their own set of features.; C). Make a list of the most popular devices among your app's users. If your app is just going to be released and there's no stats available, check similar apps.; D). Confirm your app's compatibility with the operating system you want to test. Check whether your app is at the right device by finding the app app's address on the device list.;
C).