The word "vibrant" probably means ______.
A) bright C) soft
B) light D) dark

A．The Golden Gate Bridge is the world's most beautiful bridge.
B．The Golden Gate Bridge could have been finished much earlier without the disturbing of some delicate elements.
C．It was not until May 28, 1938 that the bridge was opened to regular vehicular traffic.
D．The "Statue of Liberty" is the Golden Gate Bridge for the visitors.

A．the effect of diseases
B．how to control the number of certain animals
C．the relationship between diseases and human population
D．different kinds of diseases