Which "while" of the following shares similar(相似的)usage to the one in the sentence "Many birds live in Zhalong all year round,while some go there only for a short stay."?( )
A.Tom is very confident while Katy's shy and quiet.
B.We chatted with each other in the park for quite a while.
C.Can you help me look after my pet dog while I'm away?
D.While I was waiting for the bus,a stranger came towards me.