Correct option: D.high percentage of young individuals.
d
(d) : Age pyramid is a graphic representation of abundance of individuals of different age groups with prereproductive individuals at the base, reproductive individuals in the middle and post reproductive individuals at the top. Triangular age pyramid has high proportion of pre reproductive individuals, moderate number of reproductive individuals and fewer post reproductive individuals. It represents young or rapidly growing population. In bellshaped age pyramid, the number of prereproductive and reproductive individuals is almost equal. Post reproductive individuals are comparatively fewer. It represents stable or stationary population where growth rate is nearly zero. In urnshaped age pyramid, the number of reproductive individuals is higher than the number of prereproductive individuals. It represents declining or diminishing population.