Population explosion in a country takes place due to
(a) Birth rate is high.
(b) Death rate is high.
(c) Birth rate is high and death rate is low.
(d) Birth rate is high and death rate is high.
(a) Birth rate is high.
(b) Death rate is high.
(c) Birth rate is high and death rate is low.
(d) Birth rate is high and death rate is high.