Part 6 Text Completion

Questions 131~134 refer to the following advertisement.
Have you ever used free Wi-Fi connections at a train station or in a hospital __131__ ? While using an unverified network, using a VPN, the __132__ form of “Virtual Private Network”, is one of the best ways __133__ private and secure online, and keep your personal data protected, such as protecting your identity, file transfers and other online activities.
With thousands of hotspots in the capital city, we are very proud to offer free Wi-Fi to __134__ citizens and visitors. We have an online map for anyone wishing to find an access point. For more information, visit emap.freewificonnections.org.
【題組】131.
(A) for advice
(B) for convenience
(C) for instance
(D) for short