I believe that the choice we have is between "inform", "persuade", "entertain", etc: and I would say that here the purpose is to persuade. It's not an objective sentence only giving information, rather it tries to persuade people to choose this product over another one.
Answer:
The Rainbow Bridge is the theme of several works of poetry written in the 1980s and 1990s that speak of an other-worldly place where pets go upon death, eventually to be reunited with their owners. Each has gained popularity around the world among animal lovers who have lost a pet or wild animals that are cared for.
Explanation:
-6-14i you FOIL the form you have to get the standard form
I'm pretty sure it is Theme.
Theme is the central topic of the text. passage, story, or anything else. So it may possibly also be the same for the underlying meaning and universal truth...but again, I am not sure.