Josie is a cross-country runner. she completed a cross-country race 8 hours ago and has been sipping water since then. when she goes to the bathroom, she notices that her urine is dark in color. this is most likely a sign of:

The scenario in which Josie who is a cross-country runner despite the fact that during the 8 hours long race has been sipping water but her urine is dark in color is a sign of inadequate hydration.
She has lost more water (because of the difficulty of the race) than she has consumed.
Proper hydration is crucial in sport.

Complementary goods. they go together, thats why one price increase and the others demand increases