Question

show what you know- how to stay safe online reading
when using a public wifi network its a good idea to
quickly change your passwords
enable two factor authentication
only check your social networks, not email or banking
limit your activity to browsing websites

Explanation:

Two - factor authentication adds an extra layer of security. Changing passwords right away isn't necessary just for using public WiFi. Checking only social networks and limiting to website - browsing don't fully secure your data. Two - factor authentication helps protect accounts even if someone intercepts your password on public WiFi.

Answer:

enable two factor authentication