You are developing a Universal Windows Platform (UWP) app that will be published to the Microsoft Store.
You need to ensure that the app can access removable storage drives.
Which file should you modify?

A.
Package.appxmanifest

B.
Project.json

C.
Project.csproj

D.
App.xaml.cs

Explanation:
The removableStorage capability provides programmatic access to files on removable storage, like USB keys and external hard drives, filtered to the file-type
associations declared in the package manifest Package.appxmanifest.
Note: Capabilities must be declared in your Universal Windows Platform (UWP) app’s package manifest, Package.appxmanifest, to access certain API or resources
like pictures, music, or devices like the camera, the microphone, or removable storage devices.
The package manifest, Package.appxmanifest, is an XML document that contains the info the system needs to deploy, display, or update a Windows app.

https://msdn.microsoft.com/en-us/library/windows/apps/mt270968.aspx