Life expectancy refers to the

Life expectancy refers to the average age at which people are expected to live in a certain population or country. It is a statistical measure of the average amount of time a person can expect to live based on current mortality rates. In other words, it is the number of years a person can expect to live, on average, from birth. Life expectancy is often used as an indicator of the health and well-being of a population or country. Factors that can affect life expectancy include access to healthcare, sanitation, nutrition, and lifestyle choices. Therefore, the answer is option B: average age at which people die.