Answer:
To determine if a user was near a particular public event
Step-by-step explanation:
Because the metadata is for the "location" the app was used you look for the answer which pertains to the location of the user. Also, the app is formulated around the user's interests, age, etc. So location would be pointless unless trying to figure out their interests with said location, such as buying preference.
A and B are all invalid because they are pointless.
A) You do not need location for determining if they are interested in sports unless they are at a particular event for sports , hence D
B) You would not be able to determine if the user likes cable TV with the metadata.
So it is either between C or D.
Now which is the most relevant pertaining to the mission of the app?
Well one of them are just stalkerish and the other is the only acceptable and appropriate one.