Write the next sentence in the following story.

How to upgrade from free to premium on spotify
Go to spotify's website.
Open your preferred browser on your computer, and go to.
Log in.

Choose from:
(a). You must enter your skype username and password to join spotify. Make sure that it is not your first one and that you use the correct skype password..
(b). Click the log in link from the header. You can either use your facebook account or spotify username to login..
(c). Either log in with your username and password or, if you have an account, log in using your email. If you have poor first impressions of the website, click on the red " sign in " button on the top right side of the screen..
(d). In the upper left corner of the page you will see a pop-up with a " sign up " button; click on this to begin your account. If you have not already signed in, you can do so from the " https " menu at the top of the screen... The answer should be
(b).