[单选题]
The graph shows the results of an experiment which used razth gwss /(b*15mi an0dioactively h)dpdeaex2 8 )6u kas3labelled carbon dioxideaau62d hkd 3)ex8s pe) (14$CO_2$ ) to investigate the time taken for sap to travel to different colonies of aphids present on a plant.
Which conclusion could be supported by these results?
A. All colonies received an equal amount of sap.
B. All colonies were equally spaced along the stem of the plant.
C. Colony 1 fed on the sap more quickly than other colonies.
D. Colony 1 was located closest to the leaves.
