If the forest were to continue to be destroyed at the current rate, it would all ______ within the next 200 years.

A．They are unreasonable.
B．They are untraceable.
C．They are varied.
D．They are identical.

A．Repeated measurements of the sizes of ants.
B．Systematic observations of ants and nests.
C．Simulated experiments on ants behavior.
D．Gathering sample nests and ants.