Then, in october 2011, two of the giants fell. there were only a few tourists nearby. one photographer from germany used a video camera to record the trees crashing to the ground. luckily, nobody was hurt, but watchers were astonished that these enormous trees could topple like babies trying to take their first steps. one explanation was that the summer had been very wet, and the ground was quite hydrated. the earth might have been too soggy to hold the shallow roots of the trees. what is the main idea of the paragraph?

A. A German photographer took a video of a Sequoia falling

B. Walking through the sequoias can be dangerous

C. Two sequoias fell down recently in the park

D. Sequoia fall down easily when they get old