In a country, the birth rate is $30$ per $1000$ while the death rate is $35$ per $1000$, and there is no migration. What is the most likely cause of the population decline?
- AThe birth rate decreases and the death rate increases.
- BThe birth rate increases and the death rate remains the same.
- CThe birth rate remains constant and the death rate decreases.
- DThe increase in the birth rate is greater than the increase in the death rate.