The examples of evaluative writing from your list are:
- Writing an email to a business to explain the defects in the product you bought (this involves evaluating the product's quality).
- Writing a note to a friend explaining why you recommend a current movie (this involves expressing opinions and making a judgment about the movie).
The other two options, while they involve writing, do not focus on evaluation:
- Writing a summary of a book for an online discussion group (this is more about summarizing rather than evaluating).
- Writing a letter to a relative sharing a story from your birthday party (this is narrative writing rather than evaluative).