Answer:
C. decrease; males as they age
Step-by-step explanation:
A population pyramid shows a graphical illustration of various age groups in a population.
The given pyramid shows a drastic decrease in the males population as increase in their age. On the other side the population of female decreasing in a constant form in the pyramid but male population is majorly affected as their age increases.
Hence, the correct answer is "C. decrease; males as they age".