题目内容：

They either sat there________ or stood ________ to the ground, ________at the tree covered with hundreds of ribbons, which looked like a banner of welcome ________ in the wind.

A.stunning … rooting … starting … billowing

B.stunned … rooted … stared … billowed

C.stunning … rooting … stared … billowed

D.stunned … rooted … staring … billowing