You have to choose between playing a team sport or taking music lessons because the practices overlap. This choice demonstrates that

music lessons are scarce

sports teams are scarce

time is scarce

demand is scarce

The choice demonstrates that time is scarce

Answer: Time is scare.

Explanation:

The time is scare because there is a over lap between the team sport or taking the music lessons. This shows that time is insufficient for the demand.

The time is not sufficient for two of the activities. The time is not available for the music lessons neither the time is available for the team sport.

There is a high demand of time but two things cannot take place at the same time. The demand for time is high but there is nothing one can do for the time, she has to choose from the given two options.