Consider the following statements. 1. The rate of population growth is increasing in the country

Consider the following statements.
1. The rate of population growth is increasing in the country
2. The death rate is declining faster in the country compared to birth rate
3. The birth rate is declining faster in the country compared to death rate
4. Rural-urban migration is taking place regularly in the country
Which one of the following conclusions may be true in the light of the above facts?
(a) The rate of population growth is increasing due to rural-urban migration
(b) The rate of population growth is increasing due to decline in death rate only
(c) The rate of population growth is increasing due to increase in birth rate only
(d) The rate of population growth is increasing due to faster decline in death rate than in birth rate