What Kind of Event, If Any, Can Alter Happiness for a Period

What kind of event, if any, can alter happiness for a period of many years?

A) A better job and higher salary lead to a long-lasting increase in happiness.
B) Loss of a job or a spouse leads to a long-lasting decrease in happiness.
C) Moving to a different part of the country can produce either a long-term increase or decrease in happiness.
D) No known events alter reported happiness for more than a few months.