Which of the following statements is true about what will happen to the European Union's population in the future?
a. The need for elderly health care will increase.
b. The demand for gender equality will increase.
c. Citizens will spend more on contraceptive birth control.
d. There will be a shortage of schools and teachers.

a. The need for elderly health care will increase.

Explanation:

Several countries in the European Union today are facing the challenges of having an aging population. This simply means that there has been a rise in the median age and the number of old people. This is due to the rise in life expectancy and also reduction in birth rate.

Based on the above explanation, the statement that is true about what will happen to the European Union's population in the future is that the need for elderly health care will increase. This will lead to increase in medical expenses for the older people.

a and b because with the other three, they simplify to something else.