What is positivity offset?
a. experiencing self-elation
b. experiencing a mildly positive mood at zero input
c. exhibiting a self-serving bias when there is negative input
d. experiencing the fundamental attribution error
e. having misperceptions of one's environment

Positivity offset is B. experiencing a mildly positive mood at zero input.

Explanation:

When nothing in particular is happening, that is, when a situation is neutral, people show a tendency to experience a mildly good mood. They tend to rate their lives as positive when at zero input. That phenomenon is known as positivity offset. In general, across most cultures, people tend to display such tendency. Groups of people who do not usually show positivity offset are those who suffer from depression or who find themselves in extreme poverty.

answer: to inform

explanation: the red death is an exciting passage, but also in some ways scary, so it is not to amuse. the red death is far in the past, so it is not to warn.