Which of the following is capable of increasing the population of a country?

An increase in birth rate is capable of increasing the population of a country. Birth rate refers to the number of live births per thousand of the population per year. If the birth rate of a country increases, it means that more babies are being born per thousand of the population per year. This can lead to an increase in the population of the country over time. Therefore, option A (increase in birth rate) is the correct answer. The other options (increase in death rate, poor medical facilities, and decrease in birth rate) are likely to result in a decrease in population or a slower population growth rate.