The result of Clayton’s recent test that birds hid more pine nuts in the non-breakfast compartment indicates they have ______.

A．To tell what "high tech" and "state of the art" are.
B．To tell how "high tech" and "state of the art" have developed.
C．To give examples of high tech.
D．To describe the modern technology.

A．The data he collected.
B．Notes from research journals.
C．His research project.
D．The climate changes in his hometown.