Which of the following appears to be the strongest determinant of people's happiness?

A) Wealth: People with average wealth are happier than those with high or low levels.
B) Climate: People who live in a warm, sunny place are happier than those who live in cold, rainy areas.
C) Age: Happiness reaches its peak in the late 20s and then declines steadily.
D) Temperament: Happy people tend to remain happy throughout life.

Studies have consistently shown that temperament is the strongest determinant of people's happiness. While external factors such as wealth and climate can have a temporary impact, overall happiness is largely determined by one's natural disposition. Happy people tend to have a more positive outlook and are able to cope with stress and adversity more effectively, leading to greater long-term happiness. Additionally, while happiness may fluctuate throughout life, individuals with a generally positive temperament are more likely to maintain their happiness over time.