Read the following context and choose the best option to answer the question.
Context: My last couple of posts have been a lot about my private life , some of them a bit dark and gloomy , and others unclear and boring . Well know I ' m going to write about something else than me this time , more in the line of why I started this blogg . So today 's topic will be those small things in your day that makes you smile or laugh . Some days ago , I noticed a sign on the tram that said : " Audience must give stop signal themselves . " ( trans .
Question: Why is the writer changing the tone of the blog ?
Options: 
- They have sunken into a depression .
 - They want others to see how sad they are .
 - They wanted to see if positive content would increase engagement .
 - They are tired of being cheery all the time .


They wanted to see if positive content would increase engagement .