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

How to use whisper
Download the whisper app from the app store or google play.
The app is free on most devices and works on ios and android devices.
If you are using your computer, you can go onto their website and send a download link to your smartphone.

Available choices: a). Tap the file to which you want to install whisper. Tap " install " to install the app. b). Their website displays many whispers or secrets that you can browse, as well as information about their app. Unfortunately, you can't post or comment on the secrets displayed on their website. c). The app store contains several options, usually free and paid. Tap the " play " button to launch whisper. d). You can download the app from the app store or google play on ios devices. Open whisper under " apps and features.
b).