Which of the following is an example of a constructive population pyramid

I think you mean "Constrictive". Either way:

Constructive means there are more older people than young in a population. (population is getting smaller (constricting)

Expansive means there are more young than old in a population. (population is expanding)

Stationary means there is an equal old/young population. (population steady)

Constrictive = more old than young (population is getting smaller (constricting)