[单选题]
The graph shows the rie0on73-s s 6u xbd*iaes e39vp0gdik/arqcg* s0qm/ 6uults of an experiment which used radioactively labelled carbon dio0iu de gg6cmr/pq/v 09kqa3s *xide (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.
